12113131231021 has 4 divisors (see below), whose sum is σ = 12114632432700. Its totient is φ = 12111630029344.

The previous prime is 12113131230919. The next prime is 12113131231037. The reversal of 12113131231021 is 12013213131121.

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 4672298402500 + 7440832828521 = 2161550^2 + 2727789^2 .

It is a cyclic number.

It is not a de Polignac number, because 12113131231021 - 2²⁹ = 12112594360109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12113131230983 and 12113131231001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12113131235021) 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, 750588736 + ... + 750604873.

It is an arithmetic number, because the mean of its divisors is an integer number (3028658108175).

Almost surely, 2^{12113131231021} is an apocalyptic number.

It is an amenable number.

12113131231021 is a deficient number, since it is larger than the sum of its proper divisors (1501201679).

12113131231021 is an equidigital number, since it uses as much as digits as its factorization.

12113131231021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1501201678.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 12113131231021 its reverse (12013213131121), we get a palindrome (24126344362142).

The spelling of 12113131231021 in words is "twelve trillion, one hundred thirteen billion, one hundred thirty-one million, two hundred thirty-one thousand, twenty-one".