21365352 has 24 divisors (see below), whose sum is σ = 57864690. Its totient is φ = 7121760.

The previous prime is 21365347. The next prime is 21365353. The reversal of 21365352 is 25356312.

21365352 is a `hidden beast` number, since 2 + 1 + 3 + 653 + 5 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15634116 + 5731236 = 3954^2 + 2394^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (21365353) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 148299 + ... + 148442.

Almost surely, 2^21365352 is an apocalyptic number.

It is an amenable number.

21365352 is an abundant number, since it is smaller than the sum of its proper divisors (36499338).

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

21365352 is a wasteful number, since it uses less digits than its factorization.

21365352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296753 (or 296746 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 21365352 is about 4622.2669762791. The cubic root of 21365352 is about 277.4831935281.

The spelling of 21365352 in words is "twenty-one million, three hundred sixty-five thousand, three hundred fifty-two".