111232231220 has 96 divisors (see below), whose sum is σ = 266221468800. Its totient is φ = 38666432000.

The previous prime is 111232231211. The next prime is 111232231223. The reversal of 111232231220 is 22132232111.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 111232231192 and 111232231201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111232231223) 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, 558071 + ... + 730689.

It is an arithmetic number, because the mean of its divisors is an integer number (2773140300).

Almost surely, 2^111232231220 is an apocalyptic number.

111232231220 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 111232231220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133110734400).

111232231220 is an abundant number, since it is smaller than the sum of its proper divisors (154989237580).

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

111232231220 is a wasteful number, since it uses less digits than its factorization.

111232231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172769 (or 172767 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 111232231220 its reverse (22132232111), we get a palindrome (133364463331).

The spelling of 111232231220 in words is "one hundred eleven billion, two hundred thirty-two million, two hundred thirty-one thousand, two hundred twenty".