22 (number)

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


Cardinal	22 twenty-two
Ordinal	22nd twenty-second
Factorization	$2 \cdot 11$
Roman numeral	XXII
Binary	10110
Hexadecimal	16

In mathematics

Twenty-two is a composite number, its proper divisors being 1, 2 and 11. It is a Smith number.

Twenty-two is a pentagonal number and a centered heptagonal number.

When cutting a circle with just six line segments, the maximum number of pieces that can be so created is 22, thus 22 is a central polygonal number (see lazy caterer's sequence).

The sum of the totient function for the first eight integers is 22.

In science

The atomic number of titanium

Astronomy

Messier object M22, a magnitude 6.5 globular cluster in the constellation Sagittarius

The New General Catalogue object NGC 22, a spiral galaxy in the constellation Pegasus

The Saros number of the solar eclipse series which began on -2192 May 17 and ended on -912 June 23. The duration of Saros series 22 was 1280.1 years, and it contained 72 solar eclipses.

The Saros number of the lunar eclipse series which began on -1944 January 23 and ended on -592 April 12. The duration of Saros series 22 was 1352.2 years, and it contained 76 lunar eclipses.

In religion

There are 22 letters in the Hebrew alphabet
In the Kabbalah, there are 22 paths between the sephiroth

In numerology

The number 22 is significant in many systems of numerology, often called the Master Builder or Spiritual Master in Form. This 'master number' includes all the attributes of the number 2, twice over, and also those of the 4. People who are 22s are said to find themselves feeling as if they live in two worlds, one which is overwhelmed by the mundane, and the other by the fantastic.

In the traditional Tarot, there are 22 major arcana cards. These cards are numbered 0-21, so it is a matter of interpretation whether The Fool or The World is card number 22. The latter card is almost always associated with hard workers, a red-gold colour, and a rose-gold gemstone. Interestingly, the digital root of the 22 is the 4, which is the number of hard work.

In sports

The number of players in a rugby union squad for international and other top-level matches. Seven of the players are "on the bench", ready to play as replacements or substitutes.
The number of players on the field in a soccer match
The number of players on the field at any one time in an American football match
The jersey number of retired NFL running back Emmitt Smith

In music

The name of a song by punk band Millencolin
The underground produced song, "twenty-2", continues to gain popularity since its debute release on Halloween of 2005. The meaning of the song is still unknown

In other fields

Twenty-two is:

The number of yards in a chain. A cricket pitch is 22 yards in length
The smallest f-stop available in most single-lens reflex cameras
A bullet caliber, with a diameter of .22 of an inch. See .22
Theoretically, the minimum number of moves required to solve a Rubik's cube from any position
In the title of Joseph Heller's novel Catch-22, and consequently the expression, "Catch 22"
The basis of the political platform of U.S. Presidential candidate Love 22
An episode of The Twilight Zone in which an overworked dancer has recurring nightmares about a sinister nurse in Room 22, the morgue

Historical years

22 A.D., 22 B.C., 1922, 2022, etc.

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