21052432 has 20 divisors (see below), whose sum is σ = 40869036. Its totient is φ = 10505600.

The previous prime is 21052411. The next prime is 21052469. The reversal of 21052432 is 23425012.

It can be written as a sum of positive squares in 2 ways, for example, as 15872256 + 5180176 = 3984^2 + 2276^2 .

It is a super-2 number, since 2×21052432² = 886409786229248, which contains 22 as substring.

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, 10278 + ... + 12154.

Almost surely, 2^21052432 is an apocalyptic number.

It is an amenable number.

21052432 is a deficient number, since it is larger than the sum of its proper divisors (19816604).

21052432 is a wasteful number, since it uses less digits than its factorization.

21052432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2586 (or 2580 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21052432 is about 4588.2929287481. The cubic root of 21052432 is about 276.1218393662.

Adding to 21052432 its reverse (23425012), we get a palindrome (44477444).

The spelling of 21052432 in words is "twenty-one million, fifty-two thousand, four hundred thirty-two".