21365832 has 32 divisors (see below), whose sum is σ = 53697600. Its totient is φ = 7084224.

The previous prime is 21365819. The next prime is 21365849. The reversal of 21365832 is 23856312.

It is a self number, because there is not a number n which added to its sum of digits gives 21365832.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2469 + ... + 6987.

It is an arithmetic number, because the mean of its divisors is an integer number (1678050).

Almost surely, 2^21365832 is an apocalyptic number.

It is an amenable number.

21365832 is an abundant number, since it is smaller than the sum of its proper divisors (32331768).

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

21365832 is a wasteful number, since it uses less digits than its factorization.

21365832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4725 (or 4721 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 21365832 is about 4622.3188985616. The cubic root of 21365832 is about 277.4852715176.

The spelling of 21365832 in words is "twenty-one million, three hundred sixty-five thousand, eight hundred thirty-two".