31231311322120 has 256 divisors, whose sum is σ = 91055364825600. Its totient is φ = 9362254233600.

The previous prime is 31231311322117. The next prime is 31231311322147. The reversal of 31231311322120 is 2122311313213.

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 63 ways as a sum of consecutive naturals, for example, 405031570 + ... + 405108670.

It is an arithmetic number, because the mean of its divisors is an integer number (355685018850).

Almost surely, 2^{31231311322120} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31231311322120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45527682412800).

31231311322120 is an abundant number, since it is smaller than the sum of its proper divisors (59824053503480).

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

31231311322120 is a wasteful number, since it uses less digits than its factorization.

31231311322120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83008 (or 83004 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 31231311322120 its reverse (2122311313213), we get a palindrome (33353622635333).

The spelling of 31231311322120 in words is "thirty-one trillion, two hundred thirty-one billion, three hundred eleven million, three hundred twenty-two thousand, one hundred twenty".