13530434221 has 2 divisors, whose sum is σ = 13530434222. Its totient is φ = 13530434220.

The previous prime is 13530434191. The next prime is 13530434233. The reversal of 13530434221 is 12243403531.

It is a happy number.

13530434221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11106841321 + 2423592900 = 105389^2 + 49230^2 .

It is a cyclic number.

It is not a de Polignac number, because 13530434221 - 2²³ = 13522045613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13530434221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13530414221) 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 as a sum of consecutive naturals, namely, 6765217110 + 6765217111.

It is an arithmetic number, because the mean of its divisors is an integer number (6765217111).

Almost surely, 2^13530434221 is an apocalyptic number.

It is an amenable number.

13530434221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13530434221 is an equidigital number, since it uses as much as digits as its factorization.

13530434221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 13530434221 its reverse (12243403531), we get a palindrome (25773837752).

The spelling of 13530434221 in words is "thirteen billion, five hundred thirty million, four hundred thirty-four thousand, two hundred twenty-one".