21534232 has 16 divisors (see below), whose sum is σ = 40471200. Its totient is φ = 10741920.

The previous prime is 21534221. The next prime is 21534241. The reversal of 21534232 is 23243512.

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, 769 + ... + 6607.

It is an arithmetic number, because the mean of its divisors is an integer number (2529450).

Almost surely, 2^21534232 is an apocalyptic number.

It is an amenable number.

21534232 is a deficient number, since it is larger than the sum of its proper divisors (18936968).

21534232 is a wasteful number, since it uses less digits than its factorization.

21534232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6306 (or 6302 counting only the distinct ones).

The product of its digits is 1440, while the sum is 22.

The square root of 21534232 is about 4640.4991110871. The cubic root of 21534232 is about 278.2123870837.

Adding to 21534232 its reverse (23243512), we get a palindrome (44777744).

The spelling of 21534232 in words is "twenty-one million, five hundred thirty-four thousand, two hundred thirty-two".