12111111110220 has 48 divisors (see below), whose sum is σ = 33916495737600. Its totient is φ = 3229116807616.

The previous prime is 12111111110201. The next prime is 12111111110221. The reversal of 12111111110220 is 2201111111121.

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 12111111110220.

It is not an unprimeable number, because it can be changed into a prime (12111111110221) 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, 15644592 + ... + 16400471.

It is an arithmetic number, because the mean of its divisors is an integer number (706593661200).

Almost surely, 2^{12111111110220} is an apocalyptic number.

12111111110220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12111111110220 is an abundant number, since it is smaller than the sum of its proper divisors (21805384627380).

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

12111111110220 is a wasteful number, since it uses less digits than its factorization.

12111111110220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32051374 (or 32051372 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 12111111110220 its reverse (2201111111121), we get a palindrome (14312222221341).

Subtracting from 12111111110220 its reverse (2201111111121), we obtain a palindrome (9909999999099).

The spelling of 12111111110220 in words is "twelve trillion, one hundred eleven billion, one hundred eleven million, one hundred ten thousand, two hundred twenty".