21590872 has 16 divisors (see below), whose sum is σ = 40595400. Its totient is φ = 10765440.

The previous prime is 21590861. The next prime is 21590879. The reversal of 21590872 is 27809512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21590879) 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, 529 + ... + 6592.

Almost surely, 2^21590872 is an apocalyptic number.

It is an amenable number.

21590872 is a deficient number, since it is larger than the sum of its proper divisors (19004528).

21590872 is a wasteful number, since it uses less digits than its factorization.

21590872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7506 (or 7502 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 21590872 is about 4646.5978952347. The cubic root of 21590872 is about 278.4560944682.

The spelling of 21590872 in words is "twenty-one million, five hundred ninety thousand, eight hundred seventy-two".