21427375718 has 12 divisors (see below), whose sum is σ = 37388584332. Its totient is φ = 9183160980.

The previous prime is 21427375687. The next prime is 21427375721. The reversal of 21427375718 is 81757372412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 109323248 + ... + 109323443.

It is an arithmetic number, because the mean of its divisors is an integer number (3115715361).

Almost surely, 2^21427375718 is an apocalyptic number.

21427375718 is a deficient number, since it is larger than the sum of its proper divisors (15961208614).

21427375718 is a wasteful number, since it uses less digits than its factorization.

21427375718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218646707 (or 218646700 counting only the distinct ones).

The product of its digits is 658560, while the sum is 47.

The spelling of 21427375718 in words is "twenty-one billion, four hundred twenty-seven million, three hundred seventy-five thousand, seven hundred eighteen".