21274956 has 36 divisors (see below), whose sum is σ = 56943432. Its totient is φ = 6674304.

The previous prime is 21274949. The next prime is 21274961. The reversal of 21274956 is 65947212.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct 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 21274956.

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, 16770 + ... + 17993.

It is an arithmetic number, because the mean of its divisors is an integer number (1581762).

Almost surely, 2^21274956 is an apocalyptic number.

It is an amenable number.

21274956 is an abundant number, since it is smaller than the sum of its proper divisors (35668476).

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

21274956 is a wasteful number, since it uses less digits than its factorization.

21274956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34790 (or 34785 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 21274956 is about 4612.4782926318. The cubic root of 21274956 is about 277.0912999964.

The spelling of 21274956 in words is "twenty-one million, two hundred seventy-four thousand, nine hundred fifty-six".