21935964 has 24 divisors (see below), whose sum is σ = 52053120. Its totient is φ = 7187824.

The previous prime is 21935939. The next prime is 21935983. The reversal of 21935964 is 46953912.

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, 14784 + ... + 16199.

It is an arithmetic number, because the mean of its divisors is an integer number (2168880).

Almost surely, 2^21935964 is an apocalyptic number.

It is an amenable number.

21935964 is an abundant number, since it is smaller than the sum of its proper divisors (30117156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21935964 is a wasteful number, since it uses less digits than its factorization.

21935964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31049 (or 31047 counting only the distinct ones).

The product of its digits is 58320, while the sum is 39.

The square root of 21935964 is about 4683.5845246990. The cubic root of 21935964 is about 279.9318031192.

The spelling of 21935964 in words is "twenty-one million, nine hundred thirty-five thousand, nine hundred sixty-four".