111212220 has 48 divisors (see below), whose sum is σ = 355880448. Its totient is φ = 25419840.

The previous prime is 111212203. The next prime is 111212239. The reversal of 111212220 is 22212111.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 111212196 and 111212205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131976 + ... + 132815.

It is an arithmetic number, because the mean of its divisors is an integer number (7414176).

Almost surely, 2^111212220 is an apocalyptic number.

111212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111212220 is an abundant number, since it is smaller than the sum of its proper divisors (244668228).

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

111212220 is a wasteful number, since it uses less digits than its factorization.

111212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264810 (or 264808 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 111212220 is about 10545.7204590298. The cubic root of 111212220 is about 480.8956368107.

Adding to 111212220 its reverse (22212111), we get a palindrome (133424331).

The spelling of 111212220 in words is "one hundred eleven million, two hundred twelve thousand, two hundred twenty".