21294874 has 16 divisors (see below), whose sum is σ = 33153120. Its totient is φ = 10246320.

The previous prime is 21294859. The next prime is 21294881. The reversal of 21294874 is 47849212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32797 + ... + 33439.

It is an arithmetic number, because the mean of its divisors is an integer number (2072070).

Almost surely, 2^21294874 is an apocalyptic number.

21294874 is a deficient number, since it is larger than the sum of its proper divisors (11858246).

21294874 is a wasteful number, since it uses less digits than its factorization.

21294874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245.

The product of its digits is 32256, while the sum is 37.

The square root of 21294874 is about 4614.6369304638. The cubic root of 21294874 is about 277.1777456597.

The spelling of 21294874 in words is "twenty-one million, two hundred ninety-four thousand, eight hundred seventy-four".