111220220 has 48 divisors (see below), whose sum is σ = 242948160. Its totient is φ = 42717696.

The previous prime is 111220217. The next prime is 111220223. The reversal of 111220220 is 22022111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (111220217) and next prime (111220223).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111220223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134729 + ... + 135551.

It is an arithmetic number, because the mean of its divisors is an integer number (5061420).

Almost surely, 2^111220220 is an apocalyptic number.

111220220 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 111220220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121474080).

111220220 is an abundant number, since it is smaller than the sum of its proper divisors (131727940).

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

111220220 is a wasteful number, since it uses less digits than its factorization.

111220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094 (or 1092 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 111220220 is about 10546.0997529893. The cubic root of 111220220 is about 480.9071675365.

Adding to 111220220 its reverse (22022111), we get a palindrome (133242331).

The spelling of 111220220 in words is "one hundred eleven million, two hundred twenty thousand, two hundred twenty".