13523421421 has 2 divisors, whose sum is σ = 13523421422. Its totient is φ = 13523421420.

The previous prime is 13523421383. The next prime is 13523421467. The reversal of 13523421421 is 12412432531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9244822500 + 4278598921 = 96150^2 + 65411^2 .

It is an emirp because it is prime and its reverse (12412432531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13523421421 - 2¹¹ = 13523419373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13523421421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13523401421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6761710710 + 6761710711.

It is an arithmetic number, because the mean of its divisors is an integer number (6761710711).

Almost surely, 2^13523421421 is an apocalyptic number.

It is an amenable number.

13523421421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13523421421 is an equidigital number, since it uses as much as digits as its factorization.

13523421421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 28.

Adding to 13523421421 its reverse (12412432531), we get a palindrome (25935853952).

The spelling of 13523421421 in words is "thirteen billion, five hundred twenty-three million, four hundred twenty-one thousand, four hundred twenty-one".