21958922 has 16 divisors (see below), whose sum is σ = 33454080. Its totient is φ = 10809072.

The previous prime is 21958921. The next prime is 21958931. The reversal of 21958922 is 22985912.

It is not an unprimeable number, because it can be changed into a prime (21958921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57143 + ... + 57525.

It is an arithmetic number, because the mean of its divisors is an integer number (2090880).

Almost surely, 2^21958922 is an apocalyptic number.

21958922 is a deficient number, since it is larger than the sum of its proper divisors (11495158).

21958922 is a wasteful number, since it uses less digits than its factorization.

21958922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757.

The product of its digits is 25920, while the sum is 38.

The square root of 21958922 is about 4686.0347843353. The cubic root of 21958922 is about 280.0294271793.

The spelling of 21958922 in words is "twenty-one million, nine hundred fifty-eight thousand, nine hundred twenty-two".