131213111321 has 4 divisors (see below), whose sum is σ = 138931529652. Its totient is φ = 123494692992.

The previous prime is 131213111311. The next prime is 131213111329. The reversal of 131213111321 is 123111312131.

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 77472598921 + 53740512400 = 278339^2 + 231820^2 .

It is a cyclic number.

It is not a de Polignac number, because 131213111321 - 2¹⁴ = 131213094937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131213111293 and 131213111302.

It is not an unprimeable number, because it can be changed into a prime (131213111329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3859209140 + ... + 3859209173.

It is an arithmetic number, because the mean of its divisors is an integer number (34732882413).

Almost surely, 2^131213111321 is an apocalyptic number.

It is an amenable number.

131213111321 is a deficient number, since it is larger than the sum of its proper divisors (7718418331).

131213111321 is an equidigital number, since it uses as much as digits as its factorization.

131213111321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7718418330.

The product of its digits is 108, while the sum is 20.

Adding to 131213111321 its reverse (123111312131), we get a palindrome (254324423452).

The spelling of 131213111321 in words is "one hundred thirty-one billion, two hundred thirteen million, one hundred eleven thousand, three hundred twenty-one".