12123324221 has 2 divisors, whose sum is σ = 12123324222. Its totient is φ = 12123324220.

The previous prime is 12123324209. The next prime is 12123324253. The reversal of 12123324221 is 12242332121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7497828100 + 4625496121 = 86590^2 + 68011^2 .

It is an emirp because it is prime and its reverse (12242332121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12123324221 - 2¹⁴ = 12123307837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12123324271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061662110 + 6061662111.

It is an arithmetic number, because the mean of its divisors is an integer number (6061662111).

Almost surely, 2^12123324221 is an apocalyptic number.

It is an amenable number.

12123324221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12123324221 is an equidigital number, since it uses as much as digits as its factorization.

12123324221 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 12123324221 its reverse (12242332121), we get a palindrome (24365656342).

The spelling of 12123324221 in words is "twelve billion, one hundred twenty-three million, three hundred twenty-four thousand, two hundred twenty-one".