111212220112220 has 24 divisors (see below), whose sum is σ = 235857995529408. Its totient is φ = 44044443608000.

The previous prime is 111212220112219. The next prime is 111212220112237. The reversal of 111212220112220 is 22211022212111.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 111212220112192 and 111212220112201.

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, 27527775236 + ... + 27527779275.

It is an arithmetic number, because the mean of its divisors is an integer number (9827416480392).

Almost surely, 2^{111212220112220} is an apocalyptic number.

111212220112220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111212220112220 is an abundant number, since it is smaller than the sum of its proper divisors (124645775417188).

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

111212220112220 is a wasteful number, since it uses less digits than its factorization.

111212220112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55055554621 (or 55055554619 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 111212220112220 its reverse (22211022212111), we get a palindrome (133423242324331).

The spelling of 111212220112220 in words is "one hundred eleven trillion, two hundred twelve billion, two hundred twenty million, one hundred twelve thousand, two hundred twenty".