12221323421 has 2 divisors, whose sum is σ = 12221323422. Its totient is φ = 12221323420.

The previous prime is 12221323381. The next prime is 12221323423. The reversal of 12221323421 is 12432312221.

12221323421 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., 6683880025 + 5537443396 = 81755^2 + 74414^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221323421 - 2³⁰ = 11147581597 is a prime.

Together with 12221323423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12221323423) 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, 6110661710 + 6110661711.

It is an arithmetic number, because the mean of its divisors is an integer number (6110661711).

Almost surely, 2^12221323421 is an apocalyptic number.

It is an amenable number.

12221323421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221323421 is an equidigital number, since it uses as much as digits as its factorization.

12221323421 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 12221323421 its reverse (12432312221), we get a palindrome (24653635642).

The spelling of 12221323421 in words is "twelve billion, two hundred twenty-one million, three hundred twenty-three thousand, four hundred twenty-one".