12031031320 has 128 divisors (see below), whose sum is σ = 33849653760. Its totient is φ = 3738792960.

The previous prime is 12031031317. The next prime is 12031031357. The reversal of 12031031320 is 2313013021.

It is a junction number, because it is equal to n+sod(n) for n = 12031031294 and 12031031303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1063132 + ... + 1074388.

It is an arithmetic number, because the mean of its divisors is an integer number (264450420).

Almost surely, 2^12031031320 is an apocalyptic number.

12031031320 is a gapful number since it is divisible by the number (10) 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 12031031320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16924826880).

12031031320 is an abundant number, since it is smaller than the sum of its proper divisors (21818622440).

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

12031031320 is a wasteful number, since it uses less digits than its factorization.

12031031320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11633 (or 11629 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 12031031320 its reverse (2313013021), we get a palindrome (14344044341).

The spelling of 12031031320 in words is "twelve billion, thirty-one million, thirty-one thousand, three hundred twenty".