31121120212 has 48 divisors (see below), whose sum is σ = 67783322880. Its totient is φ = 12173306112.

The previous prime is 31121120197. The next prime is 31121120263. The reversal of 31121120212 is 21202112113.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 447928 + ... + 512719.

It is an arithmetic number, because the mean of its divisors is an integer number (1412152560).

Almost surely, 2^31121120212 is an apocalyptic number.

It is an amenable number.

31121120212 is an abundant number, since it is smaller than the sum of its proper divisors (36662202668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31121120212 is a wasteful number, since it uses less digits than its factorization.

31121120212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 960760 (or 960758 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 31121120212 its reverse (21202112113), we get a palindrome (52323232325).

The spelling of 31121120212 in words is "thirty-one billion, one hundred twenty-one million, one hundred twenty thousand, two hundred twelve".