13321130221261 has 2 divisors, whose sum is σ = 13321130221262. Its totient is φ = 13321130221260.

The previous prime is 13321130221229. The next prime is 13321130221337. The reversal of 13321130221261 is 16212203112331.

13321130221261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12977609978025 + 343520243236 = 3602445^2 + 586106^2 .

It is a cyclic number.

It is not a de Polignac number, because 13321130221261 - 2⁵ = 13321130221229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13321130221961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6660565110630 + 6660565110631.

It is an arithmetic number, because the mean of its divisors is an integer number (6660565110631).

Almost surely, 2^{13321130221261} is an apocalyptic number.

It is an amenable number.

13321130221261 is a deficient number, since it is larger than the sum of its proper divisors (1).

13321130221261 is an equidigital number, since it uses as much as digits as its factorization.

13321130221261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

Adding to 13321130221261 its reverse (16212203112331), we get a palindrome (29533333333592).

The spelling of 13321130221261 in words is "thirteen trillion, three hundred twenty-one billion, one hundred thirty million, two hundred twenty-one thousand, two hundred sixty-one".