121113110220 has 72 divisors (see below), whose sum is σ = 344962463664. Its totient is φ = 31749370752.

The previous prime is 121113110191. The next prime is 121113110221. The reversal of 121113110220 is 22011311121.

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 121113110220.

It is not an unprimeable number, because it can be changed into a prime (121113110221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81079 + ... + 498798.

Almost surely, 2^121113110220 is an apocalyptic number.

121113110220 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 121113110220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172481231832).

121113110220 is an abundant number, since it is smaller than the sum of its proper divisors (223849353444).

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

121113110220 is a wasteful number, since it uses less digits than its factorization.

121113110220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580007 (or 579946 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 121113110220 its reverse (22011311121), we get a palindrome (143124421341).

The spelling of 121113110220 in words is "one hundred twenty-one billion, one hundred thirteen million, one hundred ten thousand, two hundred twenty".