31231123012320 has 384 divisors, whose sum is σ = 122888632108032. Its totient is φ = 6477123993600.

The previous prime is 31231123012279. The next prime is 31231123012367. The reversal of 31231123012320 is 2321032113213.

It is a super-2 number, since 2×31231123012320² (a number of 28 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18445222 + ... + 20067098.

It is an arithmetic number, because the mean of its divisors is an integer number (320022479448).

Almost surely, 2^{31231123012320} is an apocalyptic number.

31231123012320 is a gapful number since it is divisible by the number (30) 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 31231123012320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61444316054016).

31231123012320 is an abundant number, since it is smaller than the sum of its proper divisors (91657509095712).

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

31231123012320 is a wasteful number, since it uses less digits than its factorization.

31231123012320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1622434 (or 1622426 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 31231123012320 its reverse (2321032113213), we get a palindrome (33552155125533).

The spelling of 31231123012320 in words is "thirty-one trillion, two hundred thirty-one billion, one hundred twenty-three million, twelve thousand, three hundred twenty".