2313131321 has 24 divisors (see below), whose sum is σ = 2522741760. Its totient is φ = 2118116000.

The previous prime is 2313131287. The next prime is 2313131329. The reversal of 2313131321 is 1231313132.

It is a de Polignac number, because none of the positive numbers 2^k-2313131321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2313131293 and 2313131302.

It is not an unprimeable number, because it can be changed into a prime (2313131329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2009096 + ... + 2010246.

It is an arithmetic number, because the mean of its divisors is an integer number (105114240).

Almost surely, 2^2313131321 is an apocalyptic number.

It is an amenable number.

2313131321 is a deficient number, since it is larger than the sum of its proper divisors (209610439).

2313131321 is a wasteful number, since it uses less digits than its factorization.

2313131321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357 (or 1334 counting only the distinct ones).

The product of its digits is 324, while the sum is 20.

The square root of 2313131321 is about 48095.0238694192. The cubic root of 2313131321 is about 1322.5134466182.

Adding to 2313131321 its reverse (1231313132), we get a palindrome (3544444453).

The spelling of 2313131321 in words is "two billion, three hundred thirteen million, one hundred thirty-one thousand, three hundred twenty-one".