13131320321 has 24 divisors (see below), whose sum is σ = 15926584320. Its totient is φ = 10781582112.

The previous prime is 13131320317. The next prime is 13131320327. The reversal of 13131320321 is 12302313131.

It is not a de Polignac number, because 13131320321 - 2² = 13131320317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13131320293 and 13131320302.

It is not an unprimeable number, because it can be changed into a prime (13131320327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144086 + ... + 216848.

It is an arithmetic number, because the mean of its divisors is an integer number (663607680).

Almost surely, 2^13131320321 is an apocalyptic number.

It is an amenable number.

13131320321 is a deficient number, since it is larger than the sum of its proper divisors (2795263999).

13131320321 is a wasteful number, since it uses less digits than its factorization.

13131320321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72933 (or 72926 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 13131320321 its reverse (12302313131), we get a palindrome (25433633452).

The spelling of 13131320321 in words is "thirteen billion, one hundred thirty-one million, three hundred twenty thousand, three hundred twenty-one".