111220218 has 24 divisors (see below), whose sum is σ = 242330400. Its totient is φ = 36865224.

The previous prime is 111220217. The next prime is 111220223. The reversal of 111220218 is 812022111.

It is a super-3 number, since 3×111220218³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 111220218.

It is not an unprimeable number, because it can be changed into a prime (111220217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14038 + ... + 20481.

It is an arithmetic number, because the mean of its divisors is an integer number (10097100).

Almost surely, 2^111220218 is an apocalyptic number.

111220218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

111220218 is an abundant number, since it is smaller than the sum of its proper divisors (131110182).

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

111220218 is a wasteful number, since it uses less digits than its factorization.

111220218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34706 (or 34703 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 111220218 is about 10546.0996581675. The cubic root of 111220218 is about 480.9071646539.

Adding to 111220218 its reverse (812022111), we get a palindrome (923242329).

The spelling of 111220218 in words is "one hundred eleven million, two hundred twenty thousand, two hundred eighteen".