21039694 has 16 divisors (see below), whose sum is σ = 34221600. Its totient is φ = 9643680.

The previous prime is 21039677. The next prime is 21039701. The reversal of 21039694 is 49693012.

It is a super-2 number, since 2×21039694² = 885337447227272, which contains 22 as substring.

It is a congruent number.

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, 1159 + ... + 6589.

It is an arithmetic number, because the mean of its divisors is an integer number (2138850).

Almost surely, 2^21039694 is an apocalyptic number.

21039694 is a deficient number, since it is larger than the sum of its proper divisors (13181906).

21039694 is a wasteful number, since it uses less digits than its factorization.

21039694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5595.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 21039694 is about 4586.9046207655. The cubic root of 21039694 is about 276.0661379693.

The spelling of 21039694 in words is "twenty-one million, thirty-nine thousand, six hundred ninety-four".