131221323313 has 4 divisors (see below), whose sum is σ = 131257950208. Its totient is φ = 131184696420.

The previous prime is 131221323301. The next prime is 131221323329. The reversal of 131221323313 is 313323122131.

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, and also an emirpimes, since its reverse is a distinct semiprime: 313323122131 = 1759 ⋅178125709.

It is a cyclic number.

It is not a de Polignac number, because 131221323313 - 2⁵ = 131221323281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131221323383) 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, 18308073 + ... + 18315238.

It is an arithmetic number, because the mean of its divisors is an integer number (32814487552).

Almost surely, 2^131221323313 is an apocalyptic number.

It is an amenable number.

131221323313 is a deficient number, since it is larger than the sum of its proper divisors (36626895).

131221323313 is an equidigital number, since it uses as much as digits as its factorization.

131221323313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36626894.

The product of its digits is 1944, while the sum is 25.

Adding to 131221323313 its reverse (313323122131), we get a palindrome (444544445444).

The spelling of 131221323313 in words is "one hundred thirty-one billion, two hundred twenty-one million, three hundred twenty-three thousand, three hundred thirteen".