111221100220120 has 128 divisors (see below), whose sum is σ = 278310918746880. Its totient is φ = 39660831936000.

The previous prime is 111221100220091. The next prime is 111221100220141. The reversal of 111221100220120 is 21022001122111.

It is a super-2 number, since 2×111221100220120² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111221100220094 and 111221100220103.

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, 2624439 + ... + 15143641.

It is an arithmetic number, because the mean of its divisors is an integer number (2174304052710).

Almost surely, 2^{111221100220120} is an apocalyptic number.

111221100220120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111221100220120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139155459373440).

111221100220120 is an abundant number, since it is smaller than the sum of its proper divisors (167089818526760).

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

111221100220120 is a wasteful number, since it uses less digits than its factorization.

111221100220120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12519617 (or 12519613 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 111221100220120 its reverse (21022001122111), we get a palindrome (132243101342231).

The spelling of 111221100220120 in words is "one hundred eleven trillion, two hundred twenty-one billion, one hundred million, two hundred twenty thousand, one hundred twenty".