111331231320 has 128 divisors (see below), whose sum is σ = 354352320000. Its totient is φ = 27885705216.

The previous prime is 111331231309. The next prime is 111331231351. The reversal of 111331231320 is 23132133111.

It is a happy number.

It is a super-3 number, since 3×111331231320³ (a number of 34 digits) contains 333 as substring.

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, 963277 + ... + 1072643.

It is an arithmetic number, because the mean of its divisors is an integer number (2768377500).

Almost surely, 2^111331231320 is an apocalyptic number.

111331231320 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 111331231320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177176160000).

111331231320 is an abundant number, since it is smaller than the sum of its proper divisors (243021088680).

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

111331231320 is a wasteful number, since it uses less digits than its factorization.

111331231320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109897 (or 109893 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 111331231320 its reverse (23132133111), we get a palindrome (134463364431).

The spelling of 111331231320 in words is "one hundred eleven billion, three hundred thirty-one million, two hundred thirty-one thousand, three hundred twenty".