21164012 has 6 divisors (see below), whose sum is σ = 37037028. Its totient is φ = 10582004.

The previous prime is 21163999. The next prime is 21164029. The reversal of 21164012 is 21046112.

It is a super-2 number, since 2×21164012² = 895830807872288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2645498 + ... + 2645505.

It is an arithmetic number, because the mean of its divisors is an integer number (6172838).

Almost surely, 2^21164012 is an apocalyptic number.

It is an amenable number.

21164012 is a deficient number, since it is larger than the sum of its proper divisors (15873016).

21164012 is a wasteful number, since it uses less digits than its factorization.

21164012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5291007 (or 5291005 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 21164012 is about 4600.4360662876. The cubic root of 21164012 is about 276.6088045315.

The spelling of 21164012 in words is "twenty-one million, one hundred sixty-four thousand, twelve".