31212112113 has 48 divisors (see below), whose sum is σ = 56037735936. Its totient is φ = 16300483200.

The previous prime is 31212112111. The next prime is 31212112147. The reversal of 31212112113 is 31121121213.

It is not a de Polignac number, because 31212112113 - 2¹ = 31212112111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31212112111) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 105945 + ... + 271382.

It is an arithmetic number, because the mean of its divisors is an integer number (1167452832).

Almost surely, 2^31212112113 is an apocalyptic number.

It is an amenable number.

31212112113 is a deficient number, since it is larger than the sum of its proper divisors (24825623823).

31212112113 is a wasteful number, since it uses less digits than its factorization.

31212112113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377454 (or 377451 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 31212112113 its reverse (31121121213), we get a palindrome (62333233326).

The spelling of 31212112113 in words is "thirty-one billion, two hundred twelve million, one hundred twelve thousand, one hundred thirteen".