21679264 has 24 divisors (see below), whose sum is σ = 42916608. Its totient is φ = 10779840.

The previous prime is 21679249. The next prime is 21679297. The reversal of 21679264 is 46297612.

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, 4339 + ... + 7885.

It is an arithmetic number, because the mean of its divisors is an integer number (1788192).

Almost surely, 2^21679264 is an apocalyptic number.

It is an amenable number.

21679264 is a deficient number, since it is larger than the sum of its proper divisors (21237344).

21679264 is a wasteful number, since it uses less digits than its factorization.

21679264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3748 (or 3740 counting only the distinct ones).

The product of its digits is 36288, while the sum is 37.

The square root of 21679264 is about 4656.0996552909. The cubic root of 21679264 is about 278.8355724059.

The spelling of 21679264 in words is "twenty-one million, six hundred seventy-nine thousand, two hundred sixty-four".