31311232213 has 16 divisors (see below), whose sum is σ = 33934697280. Its totient is φ = 28775045376.

The previous prime is 31311232207. The next prime is 31311232279. The reversal of 31311232213 is 31223211313.

It is not a de Polignac number, because 31311232213 - 2⁹ = 31311231701 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 (31311212213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3824158 + ... + 3832336.

It is an arithmetic number, because the mean of its divisors is an integer number (2120918580).

Almost surely, 2^31311232213 is an apocalyptic number.

It is an amenable number.

31311232213 is a deficient number, since it is larger than the sum of its proper divisors (2623465067).

31311232213 is a wasteful number, since it uses less digits than its factorization.

31311232213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13476.

The product of its digits is 648, while the sum is 22.

Adding to 31311232213 its reverse (31223211313), we get a palindrome (62534443526).

The spelling of 31311232213 in words is "thirty-one billion, three hundred eleven million, two hundred thirty-two thousand, two hundred thirteen".