21926928 has 20 divisors (see below), whose sum is σ = 56644688. Its totient is φ = 7308960.

The previous prime is 21926917. The next prime is 21926939. The reversal of 21926928 is 82962912.

It is an interprime number because it is at equal distance from previous prime (21926917) and next prime (21926939).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228358 + ... + 228453.

Almost surely, 2^21926928 is an apocalyptic number.

It is an amenable number.

21926928 is an abundant number, since it is smaller than the sum of its proper divisors (34717760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21926928 is a wasteful number, since it uses less digits than its factorization.

21926928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456822 (or 456816 counting only the distinct ones).

The product of its digits is 31104, while the sum is 39.

The square root of 21926928 is about 4682.6197795678. The cubic root of 21926928 is about 279.8933607517.

The spelling of 21926928 in words is "twenty-one million, nine hundred twenty-six thousand, nine hundred twenty-eight".