21504752 has 20 divisors (see below), whose sum is σ = 42073200. Its totient is φ = 10647168.

The previous prime is 21504727. The next prime is 21504781. The reversal of 21504752 is 25740512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4877 + ... + 8172.

It is an arithmetic number, because the mean of its divisors is an integer number (2103660).

Almost surely, 2^21504752 is an apocalyptic number.

It is an amenable number.

21504752 is a deficient number, since it is larger than the sum of its proper divisors (20568448).

21504752 is a wasteful number, since it uses less digits than its factorization.

21504752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13160 (or 13154 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 21504752 is about 4637.3216407750. The cubic root of 21504752 is about 278.0853730859.

The spelling of 21504752 in words is "twenty-one million, five hundred four thousand, seven hundred fifty-two".