12173321 has 2 divisors, whose sum is σ = 12173322. Its totient is φ = 12173320.

The previous prime is 12173303. The next prime is 12173323. The reversal of 12173321 is 12337121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8620096 + 3553225 = 2936^2 + 1885^2 .

It is a cyclic number.

It is not a de Polignac number, because 12173321 - 2¹⁸ = 11911177 is a prime.

Together with 12173323, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12173293 and 12173302.

It is not a weakly prime, because it can be changed into another prime (12173323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6086660 + 6086661.

It is an arithmetic number, because the mean of its divisors is an integer number (6086661).

Almost surely, 2^12173321 is an apocalyptic number.

It is an amenable number.

12173321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12173321 is an equidigital number, since it uses as much as digits as its factorization.

12173321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252, while the sum is 20.

The square root of 12173321 is about 3489.0286613899. The cubic root of 12173321 is about 230.0398229722.

The spelling of 12173321 in words is "twelve million, one hundred seventy-three thousand, three hundred twenty-one".