13643715321 has 12 divisors (see below), whose sum is σ = 19722870960. Its totient is φ = 9088756920.

The previous prime is 13643715311. The next prime is 13643715353. The reversal of 13643715321 is 12351734631.

13643715321 is a `hidden beast` number, since 1 + 3 + 643 + 7 + 1 + 5 + 3 + 2 + 1 = 666.

It is not a de Polignac number, because 13643715321 - 2²² = 13639521017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13643715311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 575511 + ... + 598748.

It is an arithmetic number, because the mean of its divisors is an integer number (1643572580).

Almost surely, 2^13643715321 is an apocalyptic number.

It is an amenable number.

13643715321 is a deficient number, since it is larger than the sum of its proper divisors (6079155639).

13643715321 is a wasteful number, since it uses less digits than its factorization.

13643715321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175556 (or 1175553 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The spelling of 13643715321 in words is "thirteen billion, six hundred forty-three million, seven hundred fifteen thousand, three hundred twenty-one".