222 (number)

Template:Numbers 0-1000
Cardinal	Two hundred [and] twenty-two
Ordinal	222nd
Factorization	$222=2\cdot 3\cdot 37$
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.

Circle divided 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.

Two hundred and twenty-two is also:

• Room 222 (TV show)
• Bell 222 (helicopter)
• The year, see AD 222 or 222 BC.