21289576715 has 24 divisors (see below), whose sum is σ = 29049466320. Its totient is φ = 14949408320.

The previous prime is 21289576691. The next prime is 21289576717. The reversal of 21289576715 is 51767598212.

It is a de Polignac number, because none of the positive numbers 2^k-21289576715 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21289576717) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 589169 + ... + 624258.

It is an arithmetic number, because the mean of its divisors is an integer number (1210394430).

Almost surely, 2^21289576715 is an apocalyptic number.

21289576715 is a deficient number, since it is larger than the sum of its proper divisors (7759889605).

21289576715 is a wasteful number, since it uses less digits than its factorization.

21289576715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213483 (or 1213472 counting only the distinct ones).

The product of its digits is 2116800, while the sum is 53.

The spelling of 21289576715 in words is "twenty-one billion, two hundred eighty-nine million, five hundred seventy-six thousand, seven hundred fifteen".