13540052321 has 4 divisors (see below), whose sum is σ = 14128750272. Its totient is φ = 12951354372.

The previous prime is 13540052263. The next prime is 13540052341. The reversal of 13540052321 is 12325004531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13540052321 - 2¹⁸ = 13539790177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13540052341) 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, 294348941 + ... + 294348986.

It is an arithmetic number, because the mean of its divisors is an integer number (3532187568).

Almost surely, 2^13540052321 is an apocalyptic number.

It is an amenable number.

13540052321 is a deficient number, since it is larger than the sum of its proper divisors (588697951).

13540052321 is an equidigital number, since it uses as much as digits as its factorization.

13540052321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588697950.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 13540052321 its reverse (12325004531), we get a palindrome (25865056852).

The spelling of 13540052321 in words is "thirteen billion, five hundred forty million, fifty-two thousand, three hundred twenty-one".