21274856 has 16 divisors (see below), whose sum is σ = 40279200. Its totient is φ = 10533744.

The previous prime is 21274831. The next prime is 21274861. The reversal of 21274856 is 65847212.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

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, 12086 + ... + 13733.

It is an arithmetic number, because the mean of its divisors is an integer number (2517450).

Almost surely, 2^21274856 is an apocalyptic number.

It is an amenable number.

21274856 is a deficient number, since it is larger than the sum of its proper divisors (19004344).

21274856 is a wasteful number, since it uses less digits than its factorization.

21274856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25928 (or 25924 counting only the distinct ones).

The product of its digits is 26880, while the sum is 35.

The square root of 21274856 is about 4612.4674524597. The cubic root of 21274856 is about 277.0908658526.

The spelling of 21274856 in words is "twenty-one million, two hundred seventy-four thousand, eight hundred fifty-six".