111111101220 has 48 divisors (see below), whose sum is σ = 355555525248. Its totient is φ = 25396823040.

The previous prime is 111111101197. The next prime is 111111101221. The reversal of 111111101220 is 22101111111.

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 = 111111101196 and 111111101205.

It is not an unprimeable number, because it can be changed into a prime (111111101221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132274701 + ... + 132275540.

It is an arithmetic number, because the mean of its divisors is an integer number (7407406776).

Almost surely, 2^111111101220 is an apocalyptic number.

111111101220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111111101220 is an abundant number, since it is smaller than the sum of its proper divisors (244444424028).

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

111111101220 is a wasteful number, since it uses less digits than its factorization.

111111101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264550260 (or 264550258 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 111111101220 its reverse (22101111111), we get a palindrome (133212212331).

The spelling of 111111101220 in words is "one hundred eleven billion, one hundred eleven million, one hundred one thousand, two hundred twenty".