12220222121 has 2 divisors, whose sum is σ = 12220222122. Its totient is φ = 12220222120.

The previous prime is 12220222117. The next prime is 12220222139. The reversal of 12220222121 is 12122202221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12189264025 + 30958096 = 110405^2 + 5564^2 .

It is a cyclic number.

It is not a de Polignac number, because 12220222121 - 2² = 12220222117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12220222121.

It is not a weakly prime, because it can be changed into another prime (12220222141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110111060 + 6110111061.

It is an arithmetic number, because the mean of its divisors is an integer number (6110111061).

Almost surely, 2^12220222121 is an apocalyptic number.

It is an amenable number.

12220222121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12220222121 is an equidigital number, since it uses as much as digits as its factorization.

12220222121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 12220222121 its reverse (12122202221), we get a palindrome (24342424342).

The spelling of 12220222121 in words is "twelve billion, two hundred twenty million, two hundred twenty-two thousand, one hundred twenty-one".