13505205421133 has 4 divisors (see below), whose sum is σ = 13506733686780. Its totient is φ = 13503677155488.

The previous prime is 13505205421073. The next prime is 13505205421153. The reversal of 13505205421133 is 33112450250531.

It is a happy number.

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 10167667387684 + 3337538033449 = 3188678^2 + 1826893^2 .

It is a cyclic number.

It is not a de Polignac number, because 13505205421133 - 2¹⁴ = 13505205404749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13505205421093 and 13505205421102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13505205421153) 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, 764119568 + ... + 764137241.

It is an arithmetic number, because the mean of its divisors is an integer number (3376683421695).

Almost surely, 2^{13505205421133} is an apocalyptic number.

It is an amenable number.

13505205421133 is a deficient number, since it is larger than the sum of its proper divisors (1528265647).

13505205421133 is an equidigital number, since it uses as much as digits as its factorization.

13505205421133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528265646.

The product of its (nonzero) digits is 54000, while the sum is 35.

Adding to 13505205421133 its reverse (33112450250531), we get a palindrome (46617655671664).

The spelling of 13505205421133 in words is "thirteen trillion, five hundred five billion, two hundred five million, four hundred twenty-one thousand, one hundred thirty-three".