12323221 has 2 divisors, whose sum is σ = 12323222. Its totient is φ = 12323220.

The previous prime is 12323219. The next prime is 12323237. The reversal of 12323221 is 12232321.

It is an a-pointer prime, because the next prime (12323237) can be obtained adding 12323221 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11088900 + 1234321 = 3330^2 + 1111^2 .

It is a cyclic number.

It is not a de Polignac number, because 12323221 - 2¹ = 12323219 is a prime.

Together with 12323219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 12323195 and 12323204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12323251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6161610 + 6161611.

It is an arithmetic number, because the mean of its divisors is an integer number (6161611).

Almost surely, 2^12323221 is an apocalyptic number.

It is an amenable number.

12323221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12323221 is an equidigital number, since it uses as much as digits as its factorization.

12323221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 16.

The square root of 12323221 is about 3510.4445587418. Note that the first 3 decimals coincide. The cubic root of 12323221 is about 230.9801960746.

Adding to 12323221 its reverse (12232321), we get a palindrome (24555542).

It can be divided in two parts, 12323 and 221, that added together give a square (12544 = 112²).

The spelling of 12323221 in words is "twelve million, three hundred twenty-three thousand, two hundred twenty-one".