31331312013212 has 24 divisors (see below), whose sum is σ = 57867858652800. Its totient is φ = 14801989080816.

The previous prime is 31331312013187. The next prime is 31331312013217. The reversal of 31331312013212 is 21231021313313.

It is a super-2 number, since 2×31331312013212² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31331312013217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 543842048 + ... + 543899655.

It is an arithmetic number, because the mean of its divisors is an integer number (2411160777200).

Almost surely, 2^{31331312013212} is an apocalyptic number.

It is an amenable number.

31331312013212 is a deficient number, since it is larger than the sum of its proper divisors (26536546639588).

31331312013212 is a wasteful number, since it uses less digits than its factorization.

31331312013212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087742105 (or 1087742103 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 31331312013212 its reverse (21231021313313), we get a palindrome (52562333326525).

The spelling of 31331312013212 in words is "thirty-one trillion, three hundred thirty-one billion, three hundred twelve million, thirteen thousand, two hundred twelve".