21396814659 has 48 divisors (see below), whose sum is σ = 34876302720. Its totient is φ = 12955258800.

The previous prime is 21396814627. The next prime is 21396814709. The reversal of 21396814659 is 95641869312.

21396814659 is a `hidden beast` number, since 2 + 13 + 96 + 81 + 465 + 9 = 666.

It is not a de Polignac number, because 21396814659 - 2⁵ = 21396814627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21396834659) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4267464 + ... + 4272474.

It is an arithmetic number, because the mean of its divisors is an integer number (726589640).

Almost surely, 2^21396814659 is an apocalyptic number.

21396814659 is a deficient number, since it is larger than the sum of its proper divisors (13479488061).

21396814659 is a wasteful number, since it uses less digits than its factorization.

21396814659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6349 (or 6332 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The spelling of 21396814659 in words is "twenty-one billion, three hundred ninety-six million, eight hundred fourteen thousand, six hundred fifty-nine".