12432521 has 2 divisors, whose sum is σ = 12432522. Its totient is φ = 12432520.

The previous prime is 12432509. The next prime is 12432523. The reversal of 12432521 is 12523421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12145225 + 287296 = 3485^2 + 536^2 .

It is an emirp because it is prime and its reverse (12523421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12432521 is a prime.

Together with 12432523, 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 = 12432493 and 12432502.

It is not a weakly prime, because it can be changed into another prime (12432523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6216260 + 6216261.

It is an arithmetic number, because the mean of its divisors is an integer number (6216261).

Almost surely, 2^12432521 is an apocalyptic number.

It is an amenable number.

12432521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12432521 is an equidigital number, since it uses as much as digits as its factorization.

12432521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 20.

The square root of 12432521 is about 3525.9780203512. The cubic root of 12432521 is about 231.6610749187.

Adding to 12432521 its reverse (12523421), we get a palindrome (24955942).

The spelling of 12432521 in words is "twelve million, four hundred thirty-two thousand, five hundred twenty-one".