12123342221 has 2 divisors, whose sum is σ = 12123342222. Its totient is φ = 12123342220.

The previous prime is 12123342181. The next prime is 12123342227. The reversal of 12123342221 is 12224332121.

12123342221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7473602500 + 4649739721 = 86450^2 + 68189^2 .

It is an emirp because it is prime and its reverse (12224332121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12123342221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12123342227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061671110 + 6061671111.

It is an arithmetic number, because the mean of its divisors is an integer number (6061671111).

Almost surely, 2^12123342221 is an apocalyptic number.

It is an amenable number.

12123342221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12123342221 is an equidigital number, since it uses as much as digits as its factorization.

12123342221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 23.

Adding to 12123342221 its reverse (12224332121), we get a palindrome (24347674342).

It can be divided in two parts, 1212 and 3342221, that added together give a palindrome (3343433).

The spelling of 12123342221 in words is "twelve billion, one hundred twenty-three million, three hundred forty-two thousand, two hundred twenty-one".