111111220 has 24 divisors (see below), whose sum is σ = 254546208. Its totient is φ = 40404000.

The previous prime is 111111199. The next prime is 111111233. The reversal of 111111220 is 22111111.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 111111197 and 111111206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252306 + ... + 252745.

It is an arithmetic number, because the mean of its divisors is an integer number (10606092).

Almost surely, 2^111111220 is an apocalyptic number.

111111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111111220 is an abundant number, since it is smaller than the sum of its proper divisors (143434988).

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

111111220 is a wasteful number, since it uses less digits than its factorization.

111111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505071 (or 505069 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 111111220 is about 10540.9306989468. The cubic root of 111111220 is about 480.7500138140.

Adding to 111111220 its reverse (22111111), we get a palindrome (133222331).

The spelling of 111111220 in words is "one hundred eleven million, one hundred eleven thousand, two hundred twenty".