13500320121 has 12 divisors (see below), whose sum is σ = 19536514660. Its totient is φ = 8983573920.

The previous prime is 13500320117. The next prime is 13500320123. The reversal of 13500320121 is 12102300531.

13500320121 is a `hidden beast` number, since 13 + 500 + 32 + 0 + 121 = 666.

13500320121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 10864935225 + 2635384896 = 104235^2 + 51336^2 .

It is not a de Polignac number, because 13500320121 - 2² = 13500320117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13500320094 and 13500320103.

It is not an unprimeable number, because it can be changed into a prime (13500320123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1381486 + ... + 1391223.

Almost surely, 2^13500320121 is an apocalyptic number.

It is an amenable number.

13500320121 is a deficient number, since it is larger than the sum of its proper divisors (6036194539).

13500320121 is a wasteful number, since it uses less digits than its factorization.

13500320121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2773256 (or 2773253 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

Adding to 13500320121 its reverse (12102300531), we get a palindrome (25602620652).

The spelling of 13500320121 in words is "thirteen billion, five hundred million, three hundred twenty thousand, one hundred twenty-one".