12100221220 has 24 divisors (see below), whose sum is σ = 25530902208. Its totient is φ = 4817148000.

The previous prime is 12100221209. The next prime is 12100221277. The reversal of 12100221220 is 2212200121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 12100221220.

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, 1429456 + ... + 1437895.

It is an arithmetic number, because the mean of its divisors is an integer number (1063787592).

Almost surely, 2^12100221220 is an apocalyptic number.

12100221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12100221220 is an abundant number, since it is smaller than the sum of its proper divisors (13430680988).

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

12100221220 is a wasteful number, since it uses less digits than its factorization.

12100221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2867571 (or 2867569 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 12100221220 its reverse (2212200121), we get a palindrome (14312421341).

The spelling of 12100221220 in words is "twelve billion, one hundred million, two hundred twenty-one thousand, two hundred twenty".