13530351321 has 8 divisors (see below), whose sum is σ = 20044964960. Its totient is φ = 9020234196.

The previous prime is 13530351313. The next prime is 13530351371. The reversal of 13530351321 is 12315303531.

13530351321 is a `hidden beast` number, since 1 + 35 + 303 + 5 + 1 + 321 = 666.

It is not a de Polignac number, because 13530351321 - 2³ = 13530351313 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 501124123 = 13530351321 / (1 + 3 + 5 + 3 + 0 + 3 + 5 + 1 + 3 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13530351301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250562035 + ... + 250562088.

It is an arithmetic number, because the mean of its divisors is an integer number (2505620620).

Almost surely, 2^13530351321 is an apocalyptic number.

It is an amenable number.

13530351321 is a deficient number, since it is larger than the sum of its proper divisors (6514613639).

13530351321 is an equidigital number, since it uses as much as digits as its factorization.

13530351321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501124132 (or 501124126 counting only the distinct ones).

The product of its (nonzero) digits is 4050, while the sum is 27.

Adding to 13530351321 its reverse (12315303531), we get a palindrome (25845654852).

It can be divided in two parts, 135303 and 51321, that added together give a square (186624 = 432²).

The spelling of 13530351321 in words is "thirteen billion, five hundred thirty million, three hundred fifty-one thousand, three hundred twenty-one".