12331131321 has 4 divisors (see below), whose sum is σ = 16441508432. Its totient is φ = 8220754212.

The previous prime is 12331131317. The next prime is 12331131331. The reversal of 12331131321 is 12313113321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12331131321 - 2² = 12331131317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12331131331) 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, 2055188551 + ... + 2055188556.

It is an arithmetic number, because the mean of its divisors is an integer number (4110377108).

Almost surely, 2^12331131321 is an apocalyptic number.

It is an amenable number.

12331131321 is a deficient number, since it is larger than the sum of its proper divisors (4110377111).

12331131321 is an equidigital number, since it uses as much as digits as its factorization.

12331131321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4110377110.

The product of its digits is 324, while the sum is 21.

Adding to 12331131321 its reverse (12313113321), we get a palindrome (24644244642).

The spelling of 12331131321 in words is "twelve billion, three hundred thirty-one million, one hundred thirty-one thousand, three hundred twenty-one".