31121103212 has 12 divisors (see below), whose sum is σ = 56829840816. Its totient is φ = 14884005840.

The previous prime is 31121103203. The next prime is 31121103229. The reversal of 31121103212 is 21230112113.

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, 169136339 + ... + 169136522.

It is an arithmetic number, because the mean of its divisors is an integer number (4735820068).

Almost surely, 2^31121103212 is an apocalyptic number.

It is an amenable number.

31121103212 is a deficient number, since it is larger than the sum of its proper divisors (25708737604).

31121103212 is a wasteful number, since it uses less digits than its factorization.

31121103212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338272888 (or 338272886 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31121103212 its reverse (21230112113), we get a palindrome (52351215325).

The spelling of 31121103212 in words is "thirty-one billion, one hundred twenty-one million, one hundred three thousand, two hundred twelve".