111121021220 has 96 divisors (see below), whose sum is σ = 269771886720. Its totient is φ = 37998397440.

The previous prime is 111121021189. The next prime is 111121021229. The reversal of 111121021220 is 22120121111.

It is a junction number, because it is equal to n+sod(n) for n = 111121021195 and 111121021204.

It is not an unprimeable number, because it can be changed into a prime (111121021229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4614371 + ... + 4638389.

It is an arithmetic number, because the mean of its divisors is an integer number (2810123820).

Almost surely, 2^111121021220 is an apocalyptic number.

111121021220 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 111121021220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134885943360).

111121021220 is an abundant number, since it is smaller than the sum of its proper divisors (158650865500).

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

111121021220 is a wasteful number, since it uses less digits than its factorization.

111121021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25293 (or 25291 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 111121021220 its reverse (22120121111), we get a palindrome (133241142331).

The spelling of 111121021220 in words is "one hundred eleven billion, one hundred twenty-one million, twenty-one thousand, two hundred twenty".