13455323521 has 2 divisors, whose sum is σ = 13455323522. Its totient is φ = 13455323520.

The previous prime is 13455323503. The next prime is 13455323533. The reversal of 13455323521 is 12532355431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9650901121 + 3804422400 = 98239^2 + 61680^2 .

It is a cyclic number.

It is not a de Polignac number, because 13455323521 - 2²³ = 13446934913 is a prime.

It is not a weakly prime, because it can be changed into another prime (13455323551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6727661760 + 6727661761.

It is an arithmetic number, because the mean of its divisors is an integer number (6727661761).

Almost surely, 2^13455323521 is an apocalyptic number.

It is an amenable number.

13455323521 is a deficient number, since it is larger than the sum of its proper divisors (1).

13455323521 is an equidigital number, since it uses as much as digits as its factorization.

13455323521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54000, while the sum is 34.

Adding to 13455323521 its reverse (12532355431), we get a palindrome (25987678952).

The spelling of 13455323521 in words is "thirteen billion, four hundred fifty-five million, three hundred twenty-three thousand, five hundred twenty-one".