12152321 has 2 divisors, whose sum is σ = 12152322. Its totient is φ = 12152320.

The previous prime is 12152299. The next prime is 12152323. The reversal of 12152321 is 12325121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11937025 + 215296 = 3455^2 + 464^2 .

It is an emirp because it is prime and its reverse (12325121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12152321 - 2¹⁰ = 12151297 is a prime.

Together with 12152323, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12152321.

It is not a weakly prime, because it can be changed into another prime (12152323) 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, 6076160 + 6076161.

It is an arithmetic number, because the mean of its divisors is an integer number (6076161).

Almost surely, 2^12152321 is an apocalyptic number.

It is an amenable number.

12152321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12152321 is an equidigital number, since it uses as much as digits as its factorization.

12152321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120, while the sum is 17.

The square root of 12152321 is about 3486.0179288122. The cubic root of 12152321 is about 229.9074675037.

Adding to 12152321 its reverse (12325121), we get a palindrome (24477442).

The spelling of 12152321 in words is "twelve million, one hundred fifty-two thousand, three hundred twenty-one".