12445444543421 has 2 divisors, whose sum is σ = 12445444543422. Its totient is φ = 12445444543420.

The previous prime is 12445444543409. The next prime is 12445444543541. The reversal of 12445444543421 is 12434544454421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11811009991225 + 634434552196 = 3436715^2 + 796514^2 .

It is an emirp because it is prime and its reverse (12434544454421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12445444543421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12445444548421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6222722271710 + 6222722271711.

It is an arithmetic number, because the mean of its divisors is an integer number (6222722271711).

Almost surely, 2^{12445444543421} is an apocalyptic number.

It is an amenable number.

12445444543421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12445444543421 is an equidigital number, since it uses as much as digits as its factorization.

12445444543421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4915200, while the sum is 47.

Adding to 12445444543421 its reverse (12434544454421), we get a palindrome (24879988997842).

The spelling of 12445444543421 in words is "twelve trillion, four hundred forty-five billion, four hundred forty-four million, five hundred forty-three thousand, four hundred twenty-one".