21715024364 has 12 divisors (see below), whose sum is σ = 41455955688. Its totient is φ = 9870465600.

The previous prime is 21715024327. The next prime is 21715024369. The reversal of 21715024364 is 46342051712.

It is a super-2 number, since 2×21715024364² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21715024369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246761597 + ... + 246761684.

It is an arithmetic number, because the mean of its divisors is an integer number (3454662974).

Almost surely, 2^21715024364 is an apocalyptic number.

It is an amenable number.

21715024364 is a deficient number, since it is larger than the sum of its proper divisors (19740931324).

21715024364 is a wasteful number, since it uses less digits than its factorization.

21715024364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493523296 (or 493523294 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The spelling of 21715024364 in words is "twenty-one billion, seven hundred fifteen million, twenty-four thousand, three hundred sixty-four".