21922256 has 20 divisors (see below), whose sum is σ = 42622272. Its totient is φ = 10922976.

The previous prime is 21922253. The next prime is 21922261. The reversal of 21922256 is 65222912.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21922253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2681 + ... + 7143.

Almost surely, 2^21922256 is an apocalyptic number.

It is an amenable number.

21922256 is a deficient number, since it is larger than the sum of its proper divisors (20700016).

21922256 is a wasteful number, since it uses less digits than its factorization.

21922256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4778 (or 4772 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 21922256 is about 4682.1208869486. The cubic root of 21922256 is about 279.8734802548.

The spelling of 21922256 in words is "twenty-one million, nine hundred twenty-two thousand, two hundred fifty-six".