13231235523421 has 4 divisors (see below), whose sum is σ = 13243080856252. Its totient is φ = 13219390190592.

The previous prime is 13231235523377. The next prime is 13231235523553. The reversal of 13231235523421 is 12432553213231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 569836265625 + 12661399257796 = 754875^2 + 3558286^2 .

It is a cyclic number.

It is not a de Polignac number, because 13231235523421 - 2³⁵ = 13196875785053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13231205523421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5922664740 + ... + 5922666973.

It is an arithmetic number, because the mean of its divisors is an integer number (3310770214063).

Almost surely, 2^{13231235523421} is an apocalyptic number.

It is an amenable number.

13231235523421 is a deficient number, since it is larger than the sum of its proper divisors (11845332831).

13231235523421 is a wasteful number, since it uses less digits than its factorization.

13231235523421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11845332830.

The product of its digits is 129600, while the sum is 37.

Adding to 13231235523421 its reverse (12432553213231), we get a palindrome (25663788736652).

The spelling of 13231235523421 in words is "thirteen trillion, two hundred thirty-one billion, two hundred thirty-five million, five hundred twenty-three thousand, four hundred twenty-one".