12122201321 has 2 divisors, whose sum is σ = 12122201322. Its totient is φ = 12122201320.

The previous prime is 12122201317. The next prime is 12122201323. The reversal of 12122201321 is 12310222121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11517582400 + 604618921 = 107320^2 + 24589^2 .

It is a cyclic number.

It is not a de Polignac number, because 12122201321 - 2² = 12122201317 is a prime.

It is a Sophie Germain prime.

Together with 12122201323, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12122201321.

It is not a weakly prime, because it can be changed into another prime (12122201323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061100660 + 6061100661.

It is an arithmetic number, because the mean of its divisors is an integer number (6061100661).

Almost surely, 2^12122201321 is an apocalyptic number.

It is an amenable number.

12122201321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12122201321 is an equidigital number, since it uses as much as digits as its factorization.

12122201321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 12122201321 its reverse (12310222121), we get a palindrome (24432423442).

The spelling of 12122201321 in words is "twelve billion, one hundred twenty-two million, two hundred one thousand, three hundred twenty-one".