21265368 has 32 divisors (see below), whose sum is σ = 56291760. Its totient is φ = 6671360.

The previous prime is 21265337. The next prime is 21265373. The reversal of 21265368 is 86356212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25653 + ... + 26468.

Almost surely, 2^21265368 is an apocalyptic number.

It is an amenable number.

21265368 is an abundant number, since it is smaller than the sum of its proper divisors (35026392).

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

21265368 is a wasteful number, since it uses less digits than its factorization.

21265368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52147 (or 52143 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 21265368 is about 4611.4388210189. The cubic root of 21265368 is about 277.0496680954.

The spelling of 21265368 in words is "twenty-one million, two hundred sixty-five thousand, three hundred sixty-eight".