13204320212521 has 2 divisors, whose sum is σ = 13204320212522. Its totient is φ = 13204320212520.

The previous prime is 13204320212507. The next prime is 13204320212557. The reversal of 13204320212521 is 12521202340231.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13180268855296 + 24051357225 = 3630464^2 + 155085^2 .

It is a cyclic number.

It is not a de Polignac number, because 13204320212521 - 2¹³ = 13204320204329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13204320212521.

It is not a weakly prime, because it can be changed into another prime (13204320212221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6602160106260 + 6602160106261.

It is an arithmetic number, because the mean of its divisors is an integer number (6602160106261).

Almost surely, 2^{13204320212521} is an apocalyptic number.

It is an amenable number.

13204320212521 is a deficient number, since it is larger than the sum of its proper divisors (1).

13204320212521 is an equidigital number, since it uses as much as digits as its factorization.

13204320212521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 13204320212521 its reverse (12521202340231), we get a palindrome (25725522552752).

The spelling of 13204320212521 in words is "thirteen trillion, two hundred four billion, three hundred twenty million, two hundred twelve thousand, five hundred twenty-one".