12131322321 has 16 divisors (see below), whose sum is σ = 16329113600. Its totient is φ = 8010748368.

The previous prime is 12131322299. The next prime is 12131322323. The reversal of 12131322321 is 12322313121.

It is not a de Polignac number, because 12131322321 - 2⁶ = 12131322257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12131322323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210120 + ... + 261558.

It is an arithmetic number, because the mean of its divisors is an integer number (1020569600).

Almost surely, 2^12131322321 is an apocalyptic number.

It is an amenable number.

12131322321 is a deficient number, since it is larger than the sum of its proper divisors (4197791279).

12131322321 is a wasteful number, since it uses less digits than its factorization.

12131322321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52188.

The product of its digits is 432, while the sum is 21.

Adding to 12131322321 its reverse (12322313121), we get a palindrome (24453635442).

The spelling of 12131322321 in words is "twelve billion, one hundred thirty-one million, three hundred twenty-two thousand, three hundred twenty-one".