31131321213112 has 16 divisors (see below), whose sum is σ = 59110103570400. Its totient is φ = 15368626927680.

The previous prime is 31131321213101. The next prime is 31131321213127. The reversal of 31131321213112 is 21131212313113.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24629209189 + ... + 24629210452.

It is an arithmetic number, because the mean of its divisors is an integer number (3694381473150).

Almost surely, 2^{31131321213112} is an apocalyptic number.

It is an amenable number.

31131321213112 is a deficient number, since it is larger than the sum of its proper divisors (27978782357288).

31131321213112 is a wasteful number, since it uses less digits than its factorization.

31131321213112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49258419726 (or 49258419722 counting only the distinct ones).

The product of its digits is 648, while the sum is 25.

Adding to 31131321213112 its reverse (21131212313113), we get a palindrome (52262533526225).

The spelling of 31131321213112 in words is "thirty-one trillion, one hundred thirty-one billion, three hundred twenty-one million, two hundred thirteen thousand, one hundred twelve".