31313120212213 has 6 divisors (see below), whose sum is σ = 36425466369366. Its totient is φ = 26839817324712.

The previous prime is 31313120212211. The next prime is 31313120212219. The reversal of 31313120212213 is 31221202131313.

It can be written as a sum of positive squares in only one way, i.e., 30352088988529 + 961031223684 = 5509273^2 + 980322^2 .

It is not a de Polignac number, because 31313120212213 - 2¹ = 31313120212211 is a prime.

It is a super-2 number, since 2×31313120212213² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31313120212211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 319521634770 + ... + 319521634867.

It is an arithmetic number, because the mean of its divisors is an integer number (6070911061561).

Almost surely, 2^{31313120212213} is an apocalyptic number.

It is an amenable number.

31313120212213 is a deficient number, since it is larger than the sum of its proper divisors (5112346157153).

31313120212213 is an equidigital number, since it uses as much as digits as its factorization.

31313120212213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639043269651 (or 639043269644 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 31313120212213 its reverse (31221202131313), we get a palindrome (62534322343526).

The spelling of 31313120212213 in words is "thirty-one trillion, three hundred thirteen billion, one hundred twenty million, two hundred twelve thousand, two hundred thirteen".