21456874 has 16 divisors (see below), whose sum is σ = 32860800. Its totient is φ = 10505664.

The previous prime is 21456859. The next prime is 21456881. The reversal of 21456874 is 47865412.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21474 + ... + 22450.

It is an arithmetic number, because the mean of its divisors is an integer number (2053800).

Almost surely, 2^21456874 is an apocalyptic number.

21456874 is a deficient number, since it is larger than the sum of its proper divisors (11403926).

21456874 is a wasteful number, since it uses less digits than its factorization.

21456874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197.

The product of its digits is 53760, while the sum is 37.

The square root of 21456874 is about 4632.1565172174. The cubic root of 21456874 is about 277.8788440889.

The spelling of 21456874 in words is "twenty-one million, four hundred fifty-six thousand, eight hundred seventy-four".