31113123021312 has 160 divisors (see below), whose sum is σ = 88253337585600. Its totient is φ = 9706447699968.

The previous prime is 31113123021311. The next prime is 31113123021353. The reversal of 31113123021312 is 21312032131113.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (31113123021311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1345764 + ... + 8002332.

It is an arithmetic number, because the mean of its divisors is an integer number (551583359910).

Almost surely, 2^{31113123021312} is an apocalyptic number.

31113123021312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31113123021312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44126668792800).

31113123021312 is an abundant number, since it is smaller than the sum of its proper divisors (57140214564288).

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

31113123021312 is a wasteful number, since it uses less digits than its factorization.

31113123021312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6656786 (or 6656770 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 31113123021312 its reverse (21312032131113), we get a palindrome (52425155152425).

The spelling of 31113123021312 in words is "thirty-one trillion, one hundred thirteen billion, one hundred twenty-three million, twenty-one thousand, three hundred twelve".