21911368 has 32 divisors (see below), whose sum is σ = 43718400. Its totient is φ = 10259712.

The previous prime is 21911347. The next prime is 21911377. The reversal of 21911368 is 86311912.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49693 + ... + 50131.

It is an arithmetic number, because the mean of its divisors is an integer number (1366200).

Almost surely, 2^21911368 is an apocalyptic number.

It is an amenable number.

21911368 is a deficient number, since it is larger than the sum of its proper divisors (21807032).

21911368 is a wasteful number, since it uses less digits than its factorization.

21911368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829 (or 825 counting only the distinct ones).

The product of its digits is 2592, while the sum is 31.

The square root of 21911368 is about 4680.9580216020. The cubic root of 21911368 is about 279.8271382013.

The spelling of 21911368 in words is "twenty-one million, nine hundred eleven thousand, three hundred sixty-eight".