21365232 has 40 divisors (see below), whose sum is σ = 63079296. Its totient is φ = 6104256.

The previous prime is 21365221. The next prime is 21365233. The reversal of 21365232 is 23256312.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31458 + ... + 32129.

Almost surely, 2^21365232 is an apocalyptic number.

It is an amenable number.

21365232 is an abundant number, since it is smaller than the sum of its proper divisors (41714064).

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

21365232 is a wasteful number, since it uses less digits than its factorization.

21365232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63605 (or 63599 counting only the distinct ones).

The product of its digits is 2160, while the sum is 24.

The square root of 21365232 is about 4622.2539956173. The cubic root of 21365232 is about 277.4826740258.

The spelling of 21365232 in words is "twenty-one million, three hundred sixty-five thousand, two hundred thirty-two".