21275356 has 12 divisors (see below), whose sum is σ = 37346680. Its totient is φ = 10604880.

The previous prime is 21275329. The next prime is 21275369. The reversal of 21275356 is 65357212.

It is a hoax number, since the sum of its digits (31) 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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6711 + ... + 9358.

Almost surely, 2^21275356 is an apocalyptic number.

It is an amenable number.

21275356 is a deficient number, since it is larger than the sum of its proper divisors (16071324).

21275356 is a wasteful number, since it uses less digits than its factorization.

21275356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16404 (or 16402 counting only the distinct ones).

The product of its digits is 12600, while the sum is 31.

The square root of 21275356 is about 4612.5216530657. The cubic root of 21275356 is about 277.0930365582.

The spelling of 21275356 in words is "twenty-one million, two hundred seventy-five thousand, three hundred fifty-six".