31020212313 has 24 divisors (see below), whose sum is σ = 45138396992. Its totient is φ = 20527496928.

The previous prime is 31020212287. The next prime is 31020212317. The reversal of 31020212313 is 31321202013.

31020212313 is a `hidden beast` number, since 310 + 20 + 21 + 2 + 313 = 666.

It is not a de Polignac number, because 31020212313 - 2⁸ = 31020212057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31020212317) 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, 1194495 + ... + 1220187.

Almost surely, 2^31020212313 is an apocalyptic number.

It is an amenable number.

31020212313 is a deficient number, since it is larger than the sum of its proper divisors (14118184679).

31020212313 is a wasteful number, since it uses less digits than its factorization.

31020212313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26685 (or 26682 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31020212313 its reverse (31321202013), we get a palindrome (62341414326).

The spelling of 31020212313 in words is "thirty-one billion, twenty million, two hundred twelve thousand, three hundred thirteen".