21572632 has 16 divisors (see below), whose sum is σ = 40498200. Its totient is φ = 10773120.

The previous prime is 21572623. The next prime is 21572641. The reversal of 21572632 is 23627512.

It is an interprime number because it is at equal distance from previous prime (21572623) and next prime (21572641).

It is a self number, because there is not a number n which added to its sum of digits gives 21572632.

It is a congruent number.

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, 11007 + ... + 12817.

Almost surely, 2^21572632 is an apocalyptic number.

It is an amenable number.

21572632 is a deficient number, since it is larger than the sum of its proper divisors (18925568).

21572632 is a wasteful number, since it uses less digits than its factorization.

21572632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3306 (or 3302 counting only the distinct ones).

The product of its digits is 5040, while the sum is 28.

The square root of 21572632 is about 4644.6347542083. The cubic root of 21572632 is about 278.3776590057.

The spelling of 21572632 in words is "twenty-one million, five hundred seventy-two thousand, six hundred thirty-two".