12127321 has 2 divisors, whose sum is σ = 12127322. Its totient is φ = 12127320.

The previous prime is 12127319. The next prime is 12127331. The reversal of 12127321 is 12372121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6656400 + 5470921 = 2580^2 + 2339^2 .

It is an emirp because it is prime and its reverse (12372121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12127321 - 2¹ = 12127319 is a prime.

Together with 12127319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12127331) 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, 6063660 + 6063661.

It is an arithmetic number, because the mean of its divisors is an integer number (6063661).

Almost surely, 2^12127321 is an apocalyptic number.

It is an amenable number.

12127321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12127321 is an equidigital number, since it uses as much as digits as its factorization.

12127321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 168, while the sum is 19.

The square root of 12127321 is about 3482.4303295256. The cubic root of 12127321 is about 229.7497025078.

Adding to 12127321 its reverse (12372121), we get a palindrome (24499442).

The spelling of 12127321 in words is "twelve million, one hundred twenty-seven thousand, three hundred twenty-one".