12523421 has 2 divisors, whose sum is σ = 12523422. Its totient is φ = 12523420.

The previous prime is 12523417. The next prime is 12523429. The reversal of 12523421 is 12432521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9060100 + 3463321 = 3010^2 + 1861^2 .

It is an emirp because it is prime and its reverse (12432521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12523421 - 2² = 12523417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12523393 and 12523402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12523429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6261710 + 6261711.

It is an arithmetic number, because the mean of its divisors is an integer number (6261711).

Almost surely, 2^12523421 is an apocalyptic number.

It is an amenable number.

12523421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12523421 is an equidigital number, since it uses as much as digits as its factorization.

12523421 is an evil number, because the sum of its binary digits is even.

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

The square root of 12523421 is about 3538.8445854544. The cubic root of 12523421 is about 232.2242987824.

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

The spelling of 12523421 in words is "twelve million, five hundred twenty-three thousand, four hundred twenty-one".