21937324 has 12 divisors (see below), whose sum is σ = 40411000. Its totient is φ = 10391328.

The previous prime is 21937319. The next prime is 21937373. The reversal of 21937324 is 42373912.

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, 144249 + ... + 144400.

Almost surely, 2^21937324 is an apocalyptic number.

It is an amenable number.

21937324 is a deficient number, since it is larger than the sum of its proper divisors (18473676).

21937324 is a wasteful number, since it uses less digits than its factorization.

21937324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288672 (or 288670 counting only the distinct ones).

The product of its digits is 9072, while the sum is 31.

The square root of 21937324 is about 4683.7297103911. The cubic root of 21937324 is about 279.9375881303.

The spelling of 21937324 in words is "twenty-one million, nine hundred thirty-seven thousand, three hundred twenty-four".