13231440420 has 96 divisors (see below), whose sum is σ = 40529341440. Its totient is φ = 3198629760.

The previous prime is 13231440413. The next prime is 13231440421. The reversal of 13231440420 is 2404413231.

It is not an unprimeable number, because it can be changed into a prime (13231440421) 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, 209019 + ... + 264861.

It is an arithmetic number, because the mean of its divisors is an integer number (422180640).

Almost surely, 2^13231440420 is an apocalyptic number.

13231440420 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 13231440420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20264670720).

13231440420 is an abundant number, since it is smaller than the sum of its proper divisors (27297901020).

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

13231440420 is a wasteful number, since it uses less digits than its factorization.

13231440420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56225 (or 56223 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 13231440420 its reverse (2404413231), we get a palindrome (15635853651).

The spelling of 13231440420 in words is "thirteen billion, two hundred thirty-one million, four hundred forty thousand, four hundred twenty".