13231331220 has 96 divisors (see below), whose sum is σ = 37377059328. Its totient is φ = 3497075712.

The previous prime is 13231331213. The next prime is 13231331221. The reversal of 13231331220 is 2213313231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13231331221) 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, 9970197 + ... + 9971523.

It is an arithmetic number, because the mean of its divisors is an integer number (389344368).

Almost surely, 2^13231331220 is an apocalyptic number.

13231331220 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 13231331220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18688529664).

13231331220 is an abundant number, since it is smaller than the sum of its proper divisors (24145728108).

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

13231331220 is a wasteful number, since it uses less digits than its factorization.

13231331220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2689 (or 2687 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 13231331220 its reverse (2213313231), we get a palindrome (15444644451).

The spelling of 13231331220 in words is "thirteen billion, two hundred thirty-one million, three hundred thirty-one thousand, two hundred twenty".