12445021 has 2 divisors, whose sum is σ = 12445022. Its totient is φ = 12445020.

The previous prime is 12445009. The next prime is 12445033. The reversal of 12445021 is 12054421.

12445021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (12445009) and next prime (12445033).

It can be written as a sum of positive squares in only one way, i.e., 10791225 + 1653796 = 3285^2 + 1286^2 .

It is an emirp because it is prime and its reverse (12054421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12445021 - 2⁷ = 12444893 is a prime.

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 12445021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12445091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6222510 + 6222511.

It is an arithmetic number, because the mean of its divisors is an integer number (6222511).

Almost surely, 2^12445021 is an apocalyptic number.

It is an amenable number.

12445021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12445021 is an equidigital number, since it uses as much as digits as its factorization.

12445021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 12445021 is about 3527.7501328751. The cubic root of 12445021 is about 231.7386883940.

Adding to 12445021 its reverse (12054421), we get a palindrome (24499442).

The spelling of 12445021 in words is "twelve million, four hundred forty-five thousand, twenty-one".