21532152 has 32 divisors (see below), whose sum is σ = 55688400. Its totient is φ = 6929664.

The previous prime is 21532097. The next prime is 21532169. The reversal of 21532152 is 25123512.

It is a super-2 number, since 2×21532152² = 927267139502208, which contains 22 as substring.

It is a congruent number.

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, 14773 + ... + 16164.

Almost surely, 2^21532152 is an apocalyptic number.

It is an amenable number.

21532152 is an abundant number, since it is smaller than the sum of its proper divisors (34156248).

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

21532152 is a wasteful number, since it uses less digits than its factorization.

21532152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30975 (or 30971 counting only the distinct ones).

The product of its digits is 600, while the sum is 21.

The square root of 21532152 is about 4640.2749918512. The cubic root of 21532152 is about 278.2034292470.

Adding to 21532152 its reverse (25123512), we get a palindrome (46655664).

The spelling of 21532152 in words is "twenty-one million, five hundred thirty-two thousand, one hundred fifty-two".