111221211122120 has 128 divisors (see below), whose sum is σ = 275800912778880. Its totient is φ = 40029050880000.

The previous prime is 111221211122107. The next prime is 111221211122123. The reversal of 111221211122120 is 21221112122111.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 111221211122092 and 111221211122101.

It is not an unprimeable number, because it can be changed into a prime (111221211122123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121888775 + ... + 122797865.

It is an arithmetic number, because the mean of its divisors is an integer number (2154694631085).

Almost surely, 2^{111221211122120} is an apocalyptic number.

111221211122120 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 111221211122120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137900456389440).

111221211122120 is an abundant number, since it is smaller than the sum of its proper divisors (164579701656760).

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

111221211122120 is a wasteful number, since it uses less digits than its factorization.

111221211122120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911967 (or 911963 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 111221211122120 its reverse (21221112122111), we get a palindrome (132442323244231).

Subtracting from 111221211122120 its reverse (21221112122111), we obtain a palindrome (90000099000009).

The spelling of 111221211122120 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred eleven million, one hundred twenty-two thousand, one hundred twenty".