13521454321 has 4 divisors (see below), whose sum is σ = 13522064500. Its totient is φ = 13520844144.

The previous prime is 13521454283. The next prime is 13521454327. The reversal of 13521454321 is 12345412531.

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 11856814321 + 1664640000 = 108889^2 + 40800^2 .

It is a cyclic number.

It is not a de Polignac number, because 13521454321 - 2⁹ = 13521453809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13521454327) 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, 270546 + ... + 316603.

It is an arithmetic number, because the mean of its divisors is an integer number (3380516125).

Almost surely, 2^13521454321 is an apocalyptic number.

It is an amenable number.

13521454321 is a deficient number, since it is larger than the sum of its proper divisors (610179).

13521454321 is an equidigital number, since it uses as much as digits as its factorization.

13521454321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610178.

The product of its digits is 14400, while the sum is 31.

Adding to 13521454321 its reverse (12345412531), we get a palindrome (25866866852).

The spelling of 13521454321 in words is "thirteen billion, five hundred twenty-one million, four hundred fifty-four thousand, three hundred twenty-one".