21363868 has 24 divisors (see below), whose sum is σ = 38137680. Its totient is φ = 10469760.

The previous prime is 21363857. The next prime is 21363877. The reversal of 21363868 is 86836312.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75888 + ... + 76168.

It is an arithmetic number, because the mean of its divisors is an integer number (1589070).

Almost surely, 2^21363868 is an apocalyptic number.

It is an amenable number.

21363868 is a deficient number, since it is larger than the sum of its proper divisors (16773812).

21363868 is a wasteful number, since it uses less digits than its factorization.

21363868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597 (or 595 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The square root of 21363868 is about 4622.1064461996. The cubic root of 21363868 is about 277.4767688801.

The spelling of 21363868 in words is "twenty-one million, three hundred sixty-three thousand, eight hundred sixty-eight".