31311123232120 has 128 divisors (see below), whose sum is σ = 76556351404800. Its totient is φ = 11480887115776.

The previous prime is 31311123232111. The next prime is 31311123232121. The reversal of 31311123232120 is 2123232111313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311123232121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1766721 + ... + 8108239.

It is an arithmetic number, because the mean of its divisors is an integer number (598096495350).

Almost surely, 2^{31311123232120} 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 31311123232120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38278175702400).

31311123232120 is an abundant number, since it is smaller than the sum of its proper divisors (45245228172680).

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

31311123232120 is a wasteful number, since it uses less digits than its factorization.

31311123232120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6341737 (or 6341733 counting only the distinct ones).

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

Adding to 31311123232120 its reverse (2123232111313), we get a palindrome (33434355343433).

The spelling of 31311123232120 in words is "thirty-one trillion, three hundred eleven billion, one hundred twenty-three million, two hundred thirty-two thousand, one hundred twenty".