21459711568 has 20 divisors (see below), whose sum is σ = 41711892768. Its totient is φ = 10695352160.

The previous prime is 21459711521. The next prime is 21459711629. The reversal of 21459711568 is 86511795412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2151346 + ... + 2161297.

Almost surely, 2^21459711568 is an apocalyptic number.

It is an amenable number.

21459711568 is a deficient number, since it is larger than the sum of its proper divisors (20252181200).

21459711568 is a wasteful number, since it uses less digits than its factorization.

21459711568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4312962 (or 4312956 counting only the distinct ones).

The product of its digits is 604800, while the sum is 49.

The spelling of 21459711568 in words is "twenty-one billion, four hundred fifty-nine million, seven hundred eleven thousand, five hundred sixty-eight".