21164304 has 40 divisors (see below), whose sum is σ = 62486080. Its totient is φ = 6046848.

The previous prime is 21164293. The next prime is 21164321. The reversal of 21164304 is 40346112.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 31159 + ... + 31830.

It is an arithmetic number, because the mean of its divisors is an integer number (1562152).

Almost surely, 2^21164304 is an apocalyptic number.

21164304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21164304 is an abundant number, since it is smaller than the sum of its proper divisors (41321776).

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

21164304 is a wasteful number, since it uses less digits than its factorization.

21164304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63007 (or 63001 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21164304 is about 4600.4678023001. The cubic root of 21164304 is about 276.6100766501.

The spelling of 21164304 in words is "twenty-one million, one hundred sixty-four thousand, three hundred four".