21384752 has 10 divisors (see below), whose sum is σ = 41432988. Its totient is φ = 10692368.

The previous prime is 21384749. The next prime is 21384763. The reversal of 21384752 is 25748312.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 668258 + ... + 668289.

Almost surely, 2^21384752 is an apocalyptic number.

It is an amenable number.

21384752 is a deficient number, since it is larger than the sum of its proper divisors (20048236).

21384752 is a wasteful number, since it uses less digits than its factorization.

21384752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336555 (or 1336549 counting only the distinct ones).

The product of its digits is 13440, while the sum is 32.

The square root of 21384752 is about 4624.3650374943. The cubic root of 21384752 is about 277.5671541612.

The spelling of 21384752 in words is "twenty-one million, three hundred eighty-four thousand, seven hundred fifty-two".