21368376 has 48 divisors (see below), whose sum is σ = 58088160. Its totient is φ = 7096320.

The previous prime is 21368363. The next prime is 21368387. The reversal of 21368376 is 67386312.

It is a happy number.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21368376.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33016 + ... + 33656.

It is an arithmetic number, because the mean of its divisors is an integer number (1210170).

Almost surely, 2^21368376 is an apocalyptic number.

It is an amenable number.

21368376 is an abundant number, since it is smaller than the sum of its proper divisors (36719784).

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

21368376 is a wasteful number, since it uses less digits than its factorization.

21368376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116 (or 1109 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 21368376 is about 4622.5940769226. The cubic root of 21368376 is about 277.4962843427.

The spelling of 21368376 in words is "twenty-one million, three hundred sixty-eight thousand, three hundred seventy-six".