22 (number)
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22 (twenty-two) is the natural number following 21 and preceding 23.
| Cardinal | twenty-two |
| Ordinal | twenty-second |
| Factorization | <math>2 \cdot 11<math> |
| Roman numeral | XXII |
| Binary | 10110 |
| Hexadecimal | 16 |
| Contents |
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.
In science
- The atomic number of titanium
In astronomy,
- Messier object M22, a magnitude 6.5 globular cluster in the constellation Sagittarius
- The New General Catalogue object (http://www.ngcic.org/) NGC 22, a spiral galaxy in the constellation Pegasus
- The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/SEsaros/SEsaros1-175.html) 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 (http://sunearth.gsfc.nasa.gov/eclipse/LEsaros/LEsaros1-175.html) 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 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 often 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 (numbered 0-21, however, so it is a matter of interpretation whether The Fool or The World is card 22).
It is almost always associated with hard workers, a red-gold colour, and a rose-gold gemstone.
Interestingly, the root of the 22 is the 4, which is the number of hard work-- and the word "work" adds up to a 22.
In other fields
Twenty-two is:
- The number of letters in the Hebrew alphabet.
- In the Kabbalah, the number of paths between the sephiroth.
- The number of yards in a chain. A cricket pitch is 22 yards in length.
- The narrowest f-stop available in most single-lens reflex cameras.
- The name of a song by punk band Millencolin.
- 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.
- 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.
- Historical years: 22 A.D., 22 B.C., or 1922
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