111242220 has 96 divisors (see below), whose sum is σ = 332107776. Its totient is φ = 27724800.

The previous prime is 111242213. The next prime is 111242233. The reversal of 111242220 is 22242111.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 111242220.

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, 194535 + ... + 195105.

It is an arithmetic number, because the mean of its divisors is an integer number (3459456).

Almost surely, 2^111242220 is an apocalyptic number.

111242220 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 111242220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166053888).

111242220 is an abundant number, since it is smaller than the sum of its proper divisors (220865556).

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

111242220 is a wasteful number, since it uses less digits than its factorization.

111242220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791 (or 789 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 111242220 is about 10547.1427410460. The cubic root of 111242220 is about 480.9388741817.

Adding to 111242220 its reverse (22242111), we get a palindrome (133484331).

The spelling of 111242220 in words is "one hundred eleven million, two hundred forty-two thousand, two hundred twenty".