31112120212 has 6 divisors (see below), whose sum is σ = 54446210378. Its totient is φ = 15556060104.

The previous prime is 31112120203. The next prime is 31112120239. The reversal of 31112120212 is 21202121113.

It can be written as a sum of positive squares in only one way, i.e., 21311912196 + 9800208016 = 145986^2 + 98996^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3889015023 + ... + 3889015030.

Almost surely, 2^31112120212 is an apocalyptic number.

It is an amenable number.

31112120212 is a deficient number, since it is larger than the sum of its proper divisors (23334090166).

31112120212 is a wasteful number, since it uses less digits than its factorization.

31112120212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7778030057 (or 7778030055 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 31112120212 its reverse (21202121113), we get a palindrome (52314241325).

Subtracting from 31112120212 its reverse (21202121113), we obtain a palindrome (9909999099).

The spelling of 31112120212 in words is "thirty-one billion, one hundred twelve million, one hundred twenty thousand, two hundred twelve".