21791074 has 8 divisors (see below), whose sum is σ = 34107840. Its totient is φ = 10421796.

The previous prime is 21791057. The next prime is 21791087. The reversal of 21791074 is 47019712.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 236814 + ... + 236905.

It is an arithmetic number, because the mean of its divisors is an integer number (4263480).

Almost surely, 2^21791074 is an apocalyptic number.

21791074 is a deficient number, since it is larger than the sum of its proper divisors (12316766).

21791074 is a wasteful number, since it uses less digits than its factorization.

21791074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473744.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 21791074 is about 4668.0910445277. The cubic root of 21791074 is about 279.3141120372.

The spelling of 21791074 in words is "twenty-one million, seven hundred ninety-one thousand, seventy-four".