31212113122312 has 16 divisors (see below), whose sum is σ = 58522783013100. Its totient is φ = 15606037652160.

The previous prime is 31212113122297. The next prime is 31212113122313. The reversal of 31212113122312 is 21322131121213.

It can be written as a sum of positive squares in 2 ways, for example, as 25595241562276 + 5616871560036 = 5059174^2 + 2369994^2 .

It is not an unprimeable number, because it can be changed into a prime (31212113122313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6692862 + ... + 10354642.

Almost surely, 2^{31212113122312} is an apocalyptic number.

It is an amenable number.

31212113122312 is a deficient number, since it is larger than the sum of its proper divisors (27310669890788).

31212113122312 is a wasteful number, since it uses less digits than its factorization.

31212113122312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4727256 (or 4727252 counting only the distinct ones).

The product of its digits is 864, while the sum is 25.

Adding to 31212113122312 its reverse (21322131121213), we get a palindrome (52534244243525).

The spelling of 31212113122312 in words is "thirty-one trillion, two hundred twelve billion, one hundred thirteen million, one hundred twenty-two thousand, three hundred twelve".