21704442960 has 40 divisors (see below), whose sum is σ = 67283773920. Its totient is φ = 5787851392.

The previous prime is 21704442917. The next prime is 21704442971. The reversal of 21704442960 is 6924440712.

It is a tau number, because it is divible by the number of its divisors (40).

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, 45217350 + ... + 45217829.

It is an arithmetic number, because the mean of its divisors is an integer number (1682094348).

Almost surely, 2^21704442960 is an apocalyptic number.

21704442960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21704442960 is an abundant number, since it is smaller than the sum of its proper divisors (45579330960).

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

21704442960 is a wasteful number, since it uses less digits than its factorization.

21704442960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90435195 (or 90435189 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The spelling of 21704442960 in words is "twenty-one billion, seven hundred four million, four hundred forty-two thousand, nine hundred sixty".