111111112122220 has 72 divisors (see below), whose sum is σ = 271668991638240. Its totient is φ = 38061495601920.

The previous prime is 111111112122203. The next prime is 111111112122259. The reversal of 111111112122220 is 22221211111111.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49105576 + ... + 51318415.

It is an arithmetic number, because the mean of its divisors is an integer number (3773180439420).

Almost surely, 2^{111111112122220} is an apocalyptic number.

111111112122220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111111112122220 is an abundant number, since it is smaller than the sum of its proper divisors (160557879516020).

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

111111112122220 is a wasteful number, since it uses less digits than its factorization.

111111112122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100425143 (or 100425134 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 111111112122220 its reverse (22221211111111), we get a palindrome (133332323233331).

The spelling of 111111112122220 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred twelve million, one hundred twenty-two thousand, two hundred twenty".