31112321212 has 12 divisors (see below), whose sum is σ = 62224642480. Its totient is φ = 13333851936.

The previous prime is 31112321117. The next prime is 31112321257. The reversal of 31112321212 is 21212321113.

31112321212 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 31112321212.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 555577137 + ... + 555577192.

Almost surely, 2^31112321212 is an apocalyptic number.

It is an amenable number.

31112321212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31112321212 is a wasteful number, since it uses less digits than its factorization.

31112321212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111154340 (or 1111154338 counting only the distinct ones).

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

Adding to 31112321212 its reverse (21212321113), we get a palindrome (52324642325).

Subtracting from 31112321212 its reverse (21212321113), we obtain a palindrome (9900000099).

The spelling of 31112321212 in words is "thirty-one billion, one hundred twelve million, three hundred twenty-one thousand, two hundred twelve".