13599598121 has 4 divisors (see below), whose sum is σ = 13668631812. Its totient is φ = 13530564432.

The previous prime is 13599598049. The next prime is 13599598157. The reversal of 13599598121 is 12189599531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6720720400 + 6878877721 = 81980^2 + 82939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13599598121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13599598421) 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, 34516550 + ... + 34516943.

It is an arithmetic number, because the mean of its divisors is an integer number (3417157953).

Almost surely, 2^13599598121 is an apocalyptic number.

It is an amenable number.

13599598121 is a deficient number, since it is larger than the sum of its proper divisors (69033691).

13599598121 is an equidigital number, since it uses as much as digits as its factorization.

13599598121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69033690.

The product of its digits is 874800, while the sum is 53.

The spelling of 13599598121 in words is "thirteen billion, five hundred ninety-nine million, five hundred ninety-eight thousand, one hundred twenty-one".