111111121220 has 48 divisors (see below), whose sum is σ = 254627102016. Its totient is φ = 40391088000.

The previous prime is 111111121213. The next prime is 111111121241. The reversal of 111111121220 is 22121111111.

It is a super-4 number, since 4×111111121220⁴ (a number of 45 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111111121195 and 111111121204.

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, 620435 + ... + 779205.

It is an arithmetic number, because the mean of its divisors is an integer number (5304731292).

Almost surely, 2^111111121220 is an apocalyptic number.

111111121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111111121220 is an abundant number, since it is smaller than the sum of its proper divisors (143515980796).

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

111111121220 is a wasteful number, since it uses less digits than its factorization.

111111121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161972 (or 161970 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 111111121220 its reverse (22121111111), we get a palindrome (133232232331).

The spelling of 111111121220 in words is "one hundred eleven billion, one hundred eleven million, one hundred twenty-one thousand, two hundred twenty".