21937023 has 12 divisors (see below), whose sum is σ = 31727488. Its totient is φ = 14605920.

The previous prime is 21936989. The next prime is 21937031. The reversal of 21937023 is 32073912.

It is not a de Polignac number, because 21937023 - 2⁸ = 21936767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21937063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12411 + ... + 14067.

Almost surely, 2^21937023 is an apocalyptic number.

21937023 is a deficient number, since it is larger than the sum of its proper divisors (9790465).

21937023 is a wasteful number, since it uses less digits than its factorization.

21937023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3134 (or 3131 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 21937023 is about 4683.6975777691. The cubic root of 21937023 is about 279.9363077918.

It can be divided in two parts, 2193 and 7023, that added together give a square (9216 = 96²).

The spelling of 21937023 in words is "twenty-one million, nine hundred thirty-seven thousand, twenty-three".