31121322212 has 12 divisors (see below), whose sum is σ = 54463672620. Its totient is φ = 15560272896.

The previous prime is 31121322209. The next prime is 31121322269. The reversal of 31121322212 is 21222312113.

It can be written as a sum of positive squares in 2 ways, for example, as 28796732416 + 2324589796 = 169696^2 + 48214^2 .

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, 157508 + ... + 295044.

It is an arithmetic number, because the mean of its divisors is an integer number (4538639385).

Almost surely, 2^31121322212 is an apocalyptic number.

It is an amenable number.

31121322212 is a deficient number, since it is larger than the sum of its proper divisors (23342350408).

31121322212 is a wasteful number, since it uses less digits than its factorization.

31121322212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194110 (or 194108 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

Adding to 31121322212 its reverse (21222312113), we get a palindrome (52343634325).

The spelling of 31121322212 in words is "thirty-one billion, one hundred twenty-one million, three hundred twenty-two thousand, two hundred twelve".