21375694 has 16 divisors (see below), whose sum is σ = 34172928. Its totient is φ = 10004632.

The previous prime is 21375661. The next prime is 21375721. The reversal of 21375694 is 49657312.

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, 2782 + ... + 7105.

It is an arithmetic number, because the mean of its divisors is an integer number (2135808).

Almost surely, 2^21375694 is an apocalyptic number.

21375694 is a deficient number, since it is larger than the sum of its proper divisors (12797234).

21375694 is a wasteful number, since it uses less digits than its factorization.

21375694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9959.

The product of its digits is 45360, while the sum is 37.

The square root of 21375694 is about 4623.3855560617. The cubic root of 21375694 is about 277.5279586580.

The spelling of 21375694 in words is "twenty-one million, three hundred seventy-five thousand, six hundred ninety-four".