12111001220 has 12 divisors (see below), whose sum is σ = 25433102604. Its totient is φ = 4844400480.

The previous prime is 12111001211. The next prime is 12111001267. The reversal of 12111001220 is 2210011121.

It can be written as a sum of positive squares in 2 ways, for example, as 3266351104 + 8844650116 = 57152^2 + 94046^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302775011 + ... + 302775050.

It is an arithmetic number, because the mean of its divisors is an integer number (2119425217).

Almost surely, 2^12111001220 is an apocalyptic number.

12111001220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12111001220 is an abundant number, since it is smaller than the sum of its proper divisors (13322101384).

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

12111001220 is a wasteful number, since it uses less digits than its factorization.

12111001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605550070 (or 605550068 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 12111001220 its reverse (2210011121), we get a palindrome (14321012341).

Subtracting from 12111001220 its reverse (2210011121), we obtain a palindrome (9900990099).

The spelling of 12111001220 in words is "twelve billion, one hundred eleven million, one thousand, two hundred twenty".