21368372 has 12 divisors (see below), whose sum is σ = 37445856. Its totient is φ = 10669560.

The previous prime is 21368363. The next prime is 21368387. The reversal of 21368372 is 27386312.

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, 47 + ... + 6537.

It is an arithmetic number, because the mean of its divisors is an integer number (3120488).

Almost surely, 2^21368372 is an apocalyptic number.

It is an amenable number.

21368372 is a deficient number, since it is larger than the sum of its proper divisors (16077484).

21368372 is a wasteful number, since it uses less digits than its factorization.

21368372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7318 (or 7316 counting only the distinct ones).

The product of its digits is 12096, while the sum is 32.

The square root of 21368372 is about 4622.5936442651. The cubic root of 21368372 is about 277.4962670277.

The spelling of 21368372 in words is "twenty-one million, three hundred sixty-eight thousand, three hundred seventy-two".