2313131111021 has 4 divisors (see below), whose sum is σ = 2313202604700. Its totient is φ = 2313059617344.

The previous prime is 2313131110949. The next prime is 2313131111101. The reversal of 2313131111021 is 1201111313132.

2313131111021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1376515562500 + 936615548521 = 1173250^2 + 967789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2313131111021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2313131110984 and 2313131111002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2313131117021) 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, 35698286 + ... + 35763023.

It is an arithmetic number, because the mean of its divisors is an integer number (578300651175).

Almost surely, 2^{2313131111021} is an apocalyptic number.

It is an amenable number.

2313131111021 is a deficient number, since it is larger than the sum of its proper divisors (71493679).

2313131111021 is an equidigital number, since it uses as much as digits as its factorization.

2313131111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71493678.

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

Adding to 2313131111021 its reverse (1201111313132), we get a palindrome (3514242424153).

The spelling of 2313131111021 in words is "two trillion, three hundred thirteen billion, one hundred thirty-one million, one hundred eleven thousand, twenty-one".