21616532 has 12 divisors (see below), whose sum is σ = 43233120. Its totient is φ = 9264216.

The previous prime is 21616501. The next prime is 21616549. The reversal of 21616532 is 23561612.

21616532 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385982 + ... + 386037.

It is an arithmetic number, because the mean of its divisors is an integer number (3602760).

Almost surely, 2^21616532 is an apocalyptic number.

It is an amenable number.

21616532 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21616532 is a wasteful number, since it uses less digits than its factorization.

21616532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772030 (or 772028 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

The square root of 21616532 is about 4649.3582352837. The cubic root of 21616532 is about 278.5663625891.

The spelling of 21616532 in words is "twenty-one million, six hundred sixteen thousand, five hundred thirty-two".