111331231213 has 4 divisors (see below), whose sum is σ = 111446362720. Its totient is φ = 111216099708.

The previous prime is 111331231163. The next prime is 111331231241. The reversal of 111331231213 is 312132133111.

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 a cyclic number.

It is not a de Polignac number, because 111331231213 - 2²⁵ = 111297676781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111331232213) 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, 57564303 + ... + 57566236.

It is an arithmetic number, because the mean of its divisors is an integer number (27861590680).

Almost surely, 2^111331231213 is an apocalyptic number.

It is an amenable number.

111331231213 is a deficient number, since it is larger than the sum of its proper divisors (115131507).

111331231213 is an equidigital number, since it uses as much as digits as its factorization.

111331231213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115131506.

The product of its digits is 324, while the sum is 22.

Adding to 111331231213 its reverse (312132133111), we get a palindrome (423463364324).

The spelling of 111331231213 in words is "one hundred eleven billion, three hundred thirty-one million, two hundred thirty-one thousand, two hundred thirteen".