13231224053521 has 2 divisors, whose sum is σ = 13231224053522. Its totient is φ = 13231224053520.

The previous prime is 13231224053519. The next prime is 13231224053587. The reversal of 13231224053521 is 12535042213231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10777727873025 + 2453496180496 = 3282945^2 + 1566364^2 .

It is a cyclic number.

It is not a de Polignac number, because 13231224053521 - 2¹ = 13231224053519 is a prime.

Together with 13231224053519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13231224053221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6615612026760 + 6615612026761.

It is an arithmetic number, because the mean of its divisors is an integer number (6615612026761).

Almost surely, 2^{13231224053521} is an apocalyptic number.

It is an amenable number.

13231224053521 is a deficient number, since it is larger than the sum of its proper divisors (1).

13231224053521 is an equidigital number, since it uses as much as digits as its factorization.

13231224053521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 13231224053521 its reverse (12535042213231), we get a palindrome (25766266266752).

The spelling of 13231224053521 in words is "thirteen trillion, two hundred thirty-one billion, two hundred twenty-four million, fifty-three thousand, five hundred twenty-one".