22937221 has 2 divisors, whose sum is σ = 22937222. Its totient is φ = 22937220.

The previous prime is 22937207. The next prime is 22937227. The reversal of 22937221 is 12273922.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15888196 + 7049025 = 3986^2 + 2655^2 .

It is a cyclic number.

It is not a de Polignac number, because 22937221 - 2⁷ = 22937093 is a prime.

It is a super-2 number, since 2×22937221² = 1052232214405682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22937221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22937227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11468610 + 11468611.

It is an arithmetic number, because the mean of its divisors is an integer number (11468611).

Almost surely, 2^22937221 is an apocalyptic number.

It is an amenable number.

22937221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22937221 is an equidigital number, since it uses as much as digits as its factorization.

22937221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 28.

The square root of 22937221 is about 4789.2818877155. The cubic root of 22937221 is about 284.1277156512.

The spelling of 22937221 in words is "twenty-two million, nine hundred thirty-seven thousand, two hundred twenty-one".