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Two hundred twenty-two is the natural number following two hundred twenty-one and preceding two hundred twenty-three. 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.
The ratio of the areas B / A equals 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.
See also
For the year, see 222 AD or 222 BC.
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