21204694 has 16 divisors (see below), whose sum is σ = 36460800. Its totient is φ = 9060264.

The previous prime is 21204683. The next prime is 21204707. The reversal of 21204694 is 49640212.

It is a congruent number.

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, 2917 + ... + 7135.

It is an arithmetic number, because the mean of its divisors is an integer number (2278800).

Almost surely, 2^21204694 is an apocalyptic number.

21204694 is a deficient number, since it is larger than the sum of its proper divisors (15256106).

21204694 is a wasteful number, since it uses less digits than its factorization.

21204694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4587.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 21204694 is about 4604.8554809027. The cubic root of 21204694 is about 276.7859259080.

The spelling of 21204694 in words is "twenty-one million, two hundred four thousand, six hundred ninety-four".