121111110220 has 48 divisors (see below), whose sum is σ = 263387829600. Its totient is φ = 46723389440.

The previous prime is 121111110193. The next prime is 121111110223. The reversal of 121111110220 is 22011111121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 121111110220.

It is not an unprimeable number, because it can be changed into a prime (121111110223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 426435 + ... + 651205.

It is an arithmetic number, because the mean of its divisors is an integer number (5487246450).

Almost surely, 2^121111110220 is an apocalyptic number.

121111110220 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 121111110220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131693914800).

121111110220 is an abundant number, since it is smaller than the sum of its proper divisors (142276719380).

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

121111110220 is a wasteful number, since it uses less digits than its factorization.

121111110220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225738 (or 225736 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121111110220 its reverse (22011111121), we get a palindrome (143122221341).

Subtracting from 121111110220 its reverse (22011111121), we obtain a palindrome (99099999099).

The spelling of 121111110220 in words is "one hundred twenty-one billion, one hundred eleven million, one hundred ten thousand, two hundred twenty".