121112201220 has 192 divisors, whose sum is σ = 360975605760. Its totient is φ = 30254515200.

The previous prime is 121112201213. The next prime is 121112201233. The reversal of 121112201220 is 22102211121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121112201220.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 46742125 + ... + 46744715.

It is an arithmetic number, because the mean of its divisors is an integer number (1880081280).

Almost surely, 2^121112201220 is an apocalyptic number.

121112201220 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 121112201220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180487802880).

121112201220 is an abundant number, since it is smaller than the sum of its proper divisors (239863404540).

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

121112201220 is a wasteful number, since it uses less digits than its factorization.

121112201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3066 (or 3064 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121112201220 its reverse (22102211121), we get a palindrome (143214412341).

Subtracting from 121112201220 its reverse (22102211121), we obtain a palindrome (99009990099).

The spelling of 121112201220 in words is "one hundred twenty-one billion, one hundred twelve million, two hundred one thousand, two hundred twenty".