21504919315 has 32 divisors (see below), whose sum is σ = 28636312320. Its totient is φ = 15371875200.

The previous prime is 21504919291. The next prime is 21504919327. The reversal of 21504919315 is 51391940512.

It is not a de Polignac number, because 21504919315 - 2⁷ = 21504919187 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1692456 + ... + 1705114.

It is an arithmetic number, because the mean of its divisors is an integer number (894884760).

Almost surely, 2^21504919315 is an apocalyptic number.

21504919315 is a deficient number, since it is larger than the sum of its proper divisors (7131393005).

21504919315 is a wasteful number, since it uses less digits than its factorization.

21504919315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13203.

The product of its (nonzero) digits is 48600, while the sum is 40.

The spelling of 21504919315 in words is "twenty-one billion, five hundred four million, nine hundred nineteen thousand, three hundred fifteen".