21904694 has 32 divisors (see below), whose sum is σ = 39882240. Its totient is φ = 8819712.

The previous prime is 21904691. The next prime is 21904723. The reversal of 21904694 is 49640912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21904691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18422 + ... + 19574.

It is an arithmetic number, because the mean of its divisors is an integer number (1246320).

Almost surely, 2^21904694 is an apocalyptic number.

21904694 is a deficient number, since it is larger than the sum of its proper divisors (17977546).

21904694 is a wasteful number, since it uses less digits than its factorization.

21904694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 21904694 is about 4680.2450790530. The cubic root of 21904694 is about 279.7987243970.

The spelling of 21904694 in words is "twenty-one million, nine hundred four thousand, six hundred ninety-four".