21364032 has 28 divisors (see below), whose sum is σ = 56526176. Its totient is φ = 7121280.

The previous prime is 21364009. The next prime is 21364061. The reversal of 21364032 is 23046312.

It is a happy number.

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, 55444 + ... + 55827.

It is an arithmetic number, because the mean of its divisors is an integer number (2018792).

Almost surely, 2^21364032 is an apocalyptic number.

It is an amenable number.

21364032 is an abundant number, since it is smaller than the sum of its proper divisors (35162144).

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

21364032 is a wasteful number, since it uses less digits than its factorization.

21364032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111286 (or 111276 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 21364032 is about 4622.1241869945. The cubic root of 21364032 is about 277.4774788963.

The spelling of 21364032 in words is "twenty-one million, three hundred sixty-four thousand, thirty-two".