21046264 has 32 divisors (see below), whose sum is σ = 40716720. Its totient is φ = 10192896.

The previous prime is 21046253. The next prime is 21046273. The reversal of 21046264 is 46264012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66234 + ... + 66550.

Almost surely, 2^21046264 is an apocalyptic number.

It is an amenable number.

21046264 is a deficient number, since it is larger than the sum of its proper divisors (19670456).

21046264 is a wasteful number, since it uses less digits than its factorization.

21046264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559 (or 555 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 21046264 is about 4587.6207341061. The cubic root of 21046264 is about 276.0948704177.

The spelling of 21046264 in words is "twenty-one million, forty-six thousand, two hundred sixty-four".