21264752 has 20 divisors (see below), whose sum is σ = 41588856. Its totient is φ = 10532160.

The previous prime is 21264709. The next prime is 21264769. The reversal of 21264752 is 25746212.

It is a happy number.

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 3 ways as a sum of consecutive naturals, for example, 4499 + ... + 7922.

Almost surely, 2^21264752 is an apocalyptic number.

It is an amenable number.

21264752 is a deficient number, since it is larger than the sum of its proper divisors (20324104).

21264752 is a wasteful number, since it uses less digits than its factorization.

21264752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12536 (or 12530 counting only the distinct ones).

The product of its digits is 6720, while the sum is 29.

The square root of 21264752 is about 4611.3720301012. The cubic root of 21264752 is about 277.0469929439.

The spelling of 21264752 in words is "twenty-one million, two hundred sixty-four thousand, seven hundred fifty-two".