21064752 has 40 divisors (see below), whose sum is σ = 60464880. Its totient is φ = 7021440.

The previous prime is 21064723. The next prime is 21064753. The reversal of 21064752 is 25746012.

21064752 is a `hidden beast` number, since 2 + 10 + 647 + 5 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21064753) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23949 + ... + 24812.

It is an arithmetic number, because the mean of its divisors is an integer number (1511622).

Almost surely, 2^21064752 is an apocalyptic number.

It is an amenable number.

21064752 is an abundant number, since it is smaller than the sum of its proper divisors (39400128).

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

21064752 is a wasteful number, since it uses less digits than its factorization.

21064752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48778 (or 48766 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 21064752 is about 4589.6352796273. The cubic root of 21064752 is about 276.1756915401.

The spelling of 21064752 in words is "twenty-one million, sixty-four thousand, seven hundred fifty-two".