111121200120 has 128 divisors (see below), whose sum is σ = 385577418240. Its totient is φ = 25093102080.

The previous prime is 111121200107. The next prime is 111121200131. The reversal of 111121200120 is 21002121111.

It is a super-2 number, since 2×111121200120² (a number of 23 digits) contains 22 as substring.

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 = 111121200096 and 111121200105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 727191 + ... + 866630.

It is an arithmetic number, because the mean of its divisors is an integer number (3012323580).

Almost surely, 2^111121200120 is an apocalyptic number.

111121200120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111121200120 is an abundant number, since it is smaller than the sum of its proper divisors (274456218120).

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

111121200120 is a wasteful number, since it uses less digits than its factorization.

111121200120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1593925 (or 1593921 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 111121200120 its reverse (21002121111), we get a palindrome (132123321231).

The spelling of 111121200120 in words is "one hundred eleven billion, one hundred twenty-one million, two hundred thousand, one hundred twenty".