• Source: 22 (number)

22 (twenty-two) is the natural number following 21 and preceding 23.




In Mathematics


22 is a semiprime, a Smith number, and an Erdős–Woods number.





22
7


=
3.14


28


…


{\displaystyle {\frac {22}{7}}=3.14{\color {red}28}\ldots }

is a commonly used approximation of the irrational number π, the ratio of the circumference of a circle to its diameter.
22 can read as "two twos", which is the only fixed point of John Conway's look-and-say function.
The number 22 appears prominently within sporadic groups. The Mathieu group M22 is one of 26 sporadic finite simple groups, defined as the 3-transitive permutation representation on 22 points. There are also 22 regular complex apeirohedra.




In science


22 is the atomic number of titanium.
22 is the number of proteinogenic amino acids.
22 is the number of bones in the human skull: 14 belong to the facial skeleton and 8 to the neurocranium.




In aircraft


22 is the designation of the USAF stealth fighter, the F-22 Raptor.




In art, entertainment, and media






= In music

=
"Twenty Two" is a song by:
Karma to Burn (2007)
The Vicar (2013)
Jordan Sweeney (2008)
The Good Life (2000)
Sweet Nectar (1996)
American Generals (2004)
Dan Anderson (2007)
Bad Cash Quartet (2006)
Millencolin (1999)
Enter the Worship Circle (2005)
Blank Dogs (2008)
Al Candello (2002)
Amen Dunes (2018)
In Jay-Z's song "22 Two's", he rhymes the words: too, to, and two, 22 times in the first verse.
"22 Acacia Avenue" is a song by Iron Maiden on the album The Number of the Beast.
Catch 22 is an album by death metal band Hypocrisy.
"22" is a song by Lily Allen on the album It's Not Me, It's You.
22 Dreams is a song and album by Paul Weller. The album has 22 songs on it.
The Norwegian electronica project Ugress uses 22 as a recurring theme. All four albums feature a track with 22 in the title.
"22" is a song by Taylor Swift on her fourth album Red.
"The Number 22" is a song by Ashbury Heights on the album The Looking Glass Society.
22, A Million is an album by Bon Iver. The first track of the album is called "22 (OVER SOON)".
Cubic 22 was a Belgian techno duo.
"22" is a song by the English alternative rock band Deaf Havana on their album Old Souls.
"22" is a song by the Irish singer Sarah McTernan. She represented Ireland with this song at Eurovision 2019.




= In other fields

=
Catch-22 (1961), Joseph Heller's novel, and its 1970 film adaptation gave rise to the expression of logic "catch-22".
Revista 22 is a magazine published in Romania.
There are 22 stars in the Paramount Pictures logo.
"Twenty Two" (February 10, 1961) is Season 2–episode 17 (February 10, 1961) of the 1959–1964 TV series The Twilight Zone, in which a hospitalized dancer has nightmares about a sinister nurse inviting her to Room 22, the hospital morgue.
Traditional Tarot decks have 22 cards with allegorical subjects. These serve as trump cards in the game. The Fool is usually a kind of wild-card among the trumps and unnumbered, so the highest trump is numbered 21. Occult Tarot decks usually have 22 similar cards which are called Major Arcana by fortune-tellers. Occultists have related this number to the 22 letters of the Hebrew alphabet and the 22 paths in the Kabbalistic Tree of Life.
"22" is the number assigned to the unborn soul who serves as a prominent character in the Pixar film Soul.
In the movie Lost in America, the wife loses all of the couple's savings, the "nest egg," by repeatedly losing at roulette betting on the number 22.




In computing and technology


22 is the standard port number for the Secure Shell protocol.




In culture and religion


There are 22 letters in the Hebrew alphabet.
In the Kabbalah, there are 22 paths between the Sephirot.
There are 22 chapters in the book: The Revelation of Jesus Christ, Book of Revelation.
22 is a master number in numerology.




In sports


In both American football and association football, a total of 22 players (counting both teams) start the game, and this is also the maximum number of players that can be legally involved in play at any given time.
In men's Australian rules football, each team is allowed a squad of 22 players (18 on the field and 4 interchanges).
The length of a cricket pitch is 22 yards.
In rugby union, the "22" is a line in each half of the field which is 22 meters from the respective try line. It has significance in a number of laws particularly relating to kicking the ball away.
A snooker game (called a "frame") starts with 22 coloured balls at specified locations on the table (15 red balls and 7 others).




In weights and measures


The number of yards in a chain.




In other uses


Twenty-two may also refer to:

22 is the number of the French department Côtes-d'Armor
"22" is a common name for the .22 calibre .22 Long Rifle cartridge.
In French jargon, "22" is used as a phrase to warn of the coming of the police (typically "22, v'là les flics !" (In English: "5-0! Cops!")
In photography, f/22 is the largest f-stop (and thus smallest aperture) available on most lenses made for single-lens reflex cameras
In Spanish lottery and bingo, 22 is nicknamed los dos patitos, 'the two little ducks' after its shape.




See also


Catch 22 (disambiguation)
List of highways numbered 22
Synchronicity




Notes






References






External links



"The Number 22 at The Database of Number Correlations". Virtuescience.

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