21273056 has 36 divisors (see below), whose sum is σ = 48722688. Its totient is φ = 9116352.

The previous prime is 21273023. The next prime is 21273061. The reversal of 21273056 is 65037212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5216 + ... + 8351.

It is an arithmetic number, because the mean of its divisors is an integer number (1353408).

Almost surely, 2^21273056 is an apocalyptic number.

It is an amenable number.

21273056 is an abundant number, since it is smaller than the sum of its proper divisors (27449632).

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

21273056 is a wasteful number, since it uses less digits than its factorization.

21273056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13591 (or 13576 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 21273056 is about 4612.2723250042. The cubic root of 21273056 is about 277.0830510308.

The spelling of 21273056 in words is "twenty-one million, two hundred seventy-three thousand, fifty-six".