31121303212 has 24 divisors (see below), whose sum is σ = 54568457216. Its totient is φ = 15530347728.

The previous prime is 31121303209. The next prime is 31121303267. The reversal of 31121303212 is 21230312113.

It is a super-2 number, since 2×31121303212² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31121303212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5531833 + ... + 5537455.

Almost surely, 2^31121303212 is an apocalyptic number.

It is an amenable number.

31121303212 is a deficient number, since it is larger than the sum of its proper divisors (23447154004).

31121303212 is a wasteful number, since it uses less digits than its factorization.

31121303212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8077 (or 8075 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31121303212 its reverse (21230312113), we get a palindrome (52351615325).

The spelling of 31121303212 in words is "thirty-one billion, one hundred twenty-one million, three hundred three thousand, two hundred twelve".