31213103313 has 16 divisors (see below), whose sum is σ = 47738341376. Its totient is φ = 17770240080.

The previous prime is 31213103297. The next prime is 31213103371. The reversal of 31213103313 is 31330131213.

It is not a de Polignac number, because 31213103313 - 2⁴ = 31213103297 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31213103313.

It is not an unprimeable number, because it can be changed into a prime (31213103413) 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, 2736631 + ... + 2748012.

It is an arithmetic number, because the mean of its divisors is an integer number (2983646336).

Almost surely, 2^31213103313 is an apocalyptic number.

It is an amenable number.

31213103313 is a deficient number, since it is larger than the sum of its proper divisors (16525238063).

31213103313 is a wasteful number, since it uses less digits than its factorization.

31213103313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5484924.

The product of its (nonzero) digits is 486, while the sum is 21.

Adding to 31213103313 its reverse (31330131213), we get a palindrome (62543234526).

The spelling of 31213103313 in words is "thirty-one billion, two hundred thirteen million, one hundred three thousand, three hundred thirteen".