21064504 has 32 divisors (see below), whose sum is σ = 41472000. Its totient is φ = 10011232.

The previous prime is 21064499. The next prime is 21064523. The reversal of 21064504 is 40546012.

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, 43737 + ... + 44215.

It is an arithmetic number, because the mean of its divisors is an integer number (1296000).

Almost surely, 2^21064504 is an apocalyptic number.

It is an amenable number.

21064504 is a deficient number, since it is larger than the sum of its proper divisors (20407496).

21064504 is a wasteful number, since it uses less digits than its factorization.

21064504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747 (or 743 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 21064504 is about 4589.6082621505. The cubic root of 21064504 is about 276.1746077099.

The spelling of 21064504 in words is "twenty-one million, sixty-four thousand, five hundred four".