31121200320312 has 64 divisors (see below), whose sum is σ = 80793690163200. Its totient is φ = 9978982485120.

The previous prime is 31121200320293. The next prime is 31121200320377. The reversal of 31121200320312 is 21302300212113.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125113987 + ... + 125362482.

It is an arithmetic number, because the mean of its divisors is an integer number (1262401408800).

Almost surely, 2^{31121200320312} is an apocalyptic number.

It is an amenable number.

31121200320312 is an abundant number, since it is smaller than the sum of its proper divisors (49672489842888).

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

31121200320312 is a wasteful number, since it uses less digits than its factorization.

31121200320312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250476676 (or 250476672 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 31121200320312 its reverse (21302300212113), we get a palindrome (52423500532425).

The spelling of 31121200320312 in words is "thirty-one trillion, one hundred twenty-one billion, two hundred million, three hundred twenty thousand, three hundred twelve".