21739152 has 40 divisors (see below), whose sum is σ = 56362464. Its totient is φ = 7220224.

The previous prime is 21739129. The next prime is 21739189. The reversal of 21739152 is 25193712.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16303 + ... + 17585.

Almost surely, 2^21739152 is an apocalyptic number.

It is an amenable number.

21739152 is an abundant number, since it is smaller than the sum of its proper divisors (34623312).

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

21739152 is a wasteful number, since it uses less digits than its factorization.

21739152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647 (or 1641 counting only the distinct ones).

The product of its digits is 3780, while the sum is 30.

The square root of 21739152 is about 4662.5263538129. The cubic root of 21739152 is about 279.0920932862.

It can be divided in two parts, 2173 and 9152, that added together give a triangular number (11325 = T₁₅₀).

The spelling of 21739152 in words is "twenty-one million, seven hundred thirty-nine thousand, one hundred fifty-two".