12111210220 has 24 divisors (see below), whose sum is σ = 25633810944. Its totient is φ = 4806337536.

The previous prime is 12111210217. The next prime is 12111210233. The reversal of 12111210220 is 2201211121.

It is a self number, because there is not a number n which added to its sum of digits gives 12111210220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2381557 + ... + 2386636.

It is an arithmetic number, because the mean of its divisors is an integer number (1068075456).

Almost surely, 2^12111210220 is an apocalyptic number.

12111210220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12111210220 is an abundant number, since it is smaller than the sum of its proper divisors (13522600724).

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

12111210220 is a wasteful number, since it uses less digits than its factorization.

12111210220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4768329 (or 4768327 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12111210220 its reverse (2201211121), we get a palindrome (14312421341).

Subtracting from 12111210220 its reverse (2201211121), we obtain a palindrome (9909999099).

The spelling of 12111210220 in words is "twelve billion, one hundred eleven million, two hundred ten thousand, two hundred twenty".