21735874 has 16 divisors (see below), whose sum is σ = 34437312. Its totient is φ = 10268368.

The previous prime is 21735859. The next prime is 21735919. The reversal of 21735874 is 47853712.

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, 972 + ... + 6664.

It is an arithmetic number, because the mean of its divisors is an integer number (2152332).

Almost surely, 2^21735874 is an apocalyptic number.

21735874 is a deficient number, since it is larger than the sum of its proper divisors (12701438).

21735874 is a wasteful number, since it uses less digits than its factorization.

21735874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5801.

The product of its digits is 47040, while the sum is 37.

The square root of 21735874 is about 4662.1748143972. The cubic root of 21735874 is about 279.0780646821.

The spelling of 21735874 in words is "twenty-one million, seven hundred thirty-five thousand, eight hundred seventy-four".