21715472318 has 16 divisors (see below), whose sum is σ = 32645907024. Its totient is φ = 10833523200.

The previous prime is 21715472299. The next prime is 21715472323. The reversal of 21715472318 is 81327451712.

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, 3362993 + ... + 3369443.

It is an arithmetic number, because the mean of its divisors is an integer number (2040369189).

Almost surely, 2^21715472318 is an apocalyptic number.

21715472318 is a deficient number, since it is larger than the sum of its proper divisors (10930434706).

21715472318 is a wasteful number, since it uses less digits than its factorization.

21715472318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9947.

The product of its digits is 94080, while the sum is 41.

The spelling of 21715472318 in words is "twenty-one billion, seven hundred fifteen million, four hundred seventy-two thousand, three hundred eighteen".