21058864 has 20 divisors (see below), whose sum is σ = 40875856. Its totient is φ = 10510272.

The previous prime is 21058853. The next prime is 21058907. The reversal of 21058864 is 46885012.

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, 12877 + ... + 14419.

Almost surely, 2^21058864 is an apocalyptic number.

It is an amenable number.

21058864 is a deficient number, since it is larger than the sum of its proper divisors (19816992).

21058864 is a wasteful number, since it uses less digits than its factorization.

21058864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2404 (or 2398 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 21058864 is about 4588.9937894924. The cubic root of 21058864 is about 276.1499570175.

The spelling of 21058864 in words is "twenty-one million, fifty-eight thousand, eight hundred sixty-four".