222 (number)
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| Cardinal | Two hundred [and] twenty-two |
| Ordinal | 222nd |
| Factorization | <math>222 = 2 \cdot 3 \cdot 37<math> |
| Roman numeral | CCXXII |
| Binary | 11011110 |
| Hexadecimal | DE |
222 (two hundred [and] twenty-two) is the natural number following 221 and preceding 223. It is a repdigit composite number, and its factorization makes it a sphenic number. It is also a Harshad number.
There is no solution to the equation x - φ(x) = 222, making 222 a noncototient. Nor is there, in base 10, an integer that added to the sum of its own digits yields 222, making 222 a self number.
Radii at 0° and approximately 222.49° divide a circle in the golden ratio.
Missing image
Circle-golden_ratio2.png
Circle divided in the golden ratio
Circle-golden_ratio2.png
Circle divided in the golden ratio
The first triple repdigit in the square root of 222 is 222:
- √222 =
- 14.89966442575133971933181604612395114023452166218124
- 73380574030119289350747022456370098357196526519656
- 52139396484012226637696242316850851449289924...
A prime reciprocal magic square based on 223 in base three has a magic constant of 222.
Given 10 unlabelled nodes, 222 lattices can be created.
Two hundred and twenty-two is also: