111111001220120 has 64 divisors (see below), whose sum is σ = 272756017405440. Its totient is φ = 40399702012800.

The previous prime is 111111001220111. The next prime is 111111001220137. The reversal of 111111001220120 is 21022100111111.

It is a junction number, because it is equal to n+sod(n) for n = 111111001220095 and 111111001220104.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9290576 + ... + 17565215.

It is an arithmetic number, because the mean of its divisors is an integer number (4261812771960).

Almost surely, 2^{111111001220120} is an apocalyptic number.

111111001220120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111111001220120 is an abundant number, since it is smaller than the sum of its proper divisors (161645016185320).

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

111111001220120 is a wasteful number, since it uses less digits than its factorization.

111111001220120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26865216 (or 26865212 counting only the distinct ones).

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

Adding to 111111001220120 its reverse (21022100111111), we get a palindrome (132133101331231).

The spelling of 111111001220120 in words is "one hundred eleven trillion, one hundred eleven billion, one million, two hundred twenty thousand, one hundred twenty".