21916932 has 12 divisors (see below), whose sum is σ = 51139536. Its totient is φ = 7305640.

The previous prime is 21916901. The next prime is 21916967. The reversal of 21916932 is 23961912.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21916893 and 21916902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 913194 + ... + 913217.

It is an arithmetic number, because the mean of its divisors is an integer number (4261628).

Almost surely, 2^21916932 is an apocalyptic number.

It is an amenable number.

21916932 is an abundant number, since it is smaller than the sum of its proper divisors (29222604).

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

21916932 is a wasteful number, since it uses less digits than its factorization.

21916932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1826418 (or 1826416 counting only the distinct ones).

The product of its digits is 5832, while the sum is 33.

The square root of 21916932 is about 4681.5523066607. The cubic root of 21916932 is about 279.8508218957.

The spelling of 21916932 in words is "twenty-one million, nine hundred sixteen thousand, nine hundred thirty-two".