31221131212 has 6 divisors (see below), whose sum is σ = 54636979628. Its totient is φ = 15610565604.

The previous prime is 31221131177. The next prime is 31221131219. The reversal of 31221131212 is 21213112213.

It is a self number, because there is not a number n which added to its sum of digits gives 31221131212.

It is not an unprimeable number, because it can be changed into a prime (31221131219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3902641398 + ... + 3902641405.

Almost surely, 2^31221131212 is an apocalyptic number.

It is an amenable number.

31221131212 is a deficient number, since it is larger than the sum of its proper divisors (23415848416).

31221131212 is a wasteful number, since it uses less digits than its factorization.

31221131212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7805282807 (or 7805282805 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

Adding to 31221131212 its reverse (21213112213), we get a palindrome (52434243425).

The spelling of 31221131212 in words is "thirty-one billion, two hundred twenty-one million, one hundred thirty-one thousand, two hundred twelve".