111218220 has 36 divisors (see below), whose sum is σ = 337362480. Its totient is φ = 29658144.

The previous prime is 111218213. The next prime is 111218231. The reversal of 111218220 is 22812111.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 111218193 and 111218202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 308760 + ... + 309119.

It is an arithmetic number, because the mean of its divisors is an integer number (9371180).

Almost surely, 2^111218220 is an apocalyptic number.

111218220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111218220 is an abundant number, since it is smaller than the sum of its proper divisors (226144260).

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

111218220 is a wasteful number, since it uses less digits than its factorization.

111218220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617894 (or 617889 counting only the distinct ones).

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

The square root of 111218220 is about 10546.0049307783. The cubic root of 111218220 is about 480.9042849069.

The spelling of 111218220 in words is "one hundred eleven million, two hundred eighteen thousand, two hundred twenty".