12213221444321 has 2 divisors, whose sum is σ = 12213221444322. Its totient is φ = 12213221444320.

The previous prime is 12213221444309. The next prime is 12213221444353. The reversal of 12213221444321 is 12344412231221.

It is an a-pointer prime, because the next prime (12213221444353) can be obtained adding 12213221444321 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8526610241296 + 3686611203025 = 2920036^2 + 1920055^2 .

It is a cyclic number.

It is not a de Polignac number, because 12213221444321 - 2¹⁸ = 12213221182177 is a prime.

It is not a weakly prime, because it can be changed into another prime (12213221449321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6106610722160 + 6106610722161.

It is an arithmetic number, because the mean of its divisors is an integer number (6106610722161).

Almost surely, 2^{12213221444321} is an apocalyptic number.

It is an amenable number.

12213221444321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12213221444321 is an equidigital number, since it uses as much as digits as its factorization.

12213221444321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 32.

Adding to 12213221444321 its reverse (12344412231221), we get a palindrome (24557633675542).

The spelling of 12213221444321 in words is "twelve trillion, two hundred thirteen billion, two hundred twenty-one million, four hundred forty-four thousand, three hundred twenty-one".