21275256 has 16 divisors (see below), whose sum is σ = 53188200. Its totient is φ = 7091744.

The previous prime is 21275237. The next prime is 21275281. The reversal of 21275256 is 65257212.

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, 443211 + ... + 443258.

Almost surely, 2^21275256 is an apocalyptic number.

It is an amenable number.

21275256 is an abundant number, since it is smaller than the sum of its proper divisors (31912944).

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

21275256 is a wasteful number, since it uses less digits than its factorization.

21275256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886478 (or 886474 counting only the distinct ones).

The product of its digits is 8400, while the sum is 30.

The square root of 21275256 is about 4612.5108129955. The cubic root of 21275256 is about 277.0926024198.

The spelling of 21275256 in words is "twenty-one million, two hundred seventy-five thousand, two hundred fifty-six".