13321212161 has 2 divisors, whose sum is σ = 13321212162. Its totient is φ = 13321212160.

The previous prime is 13321212119. The next prime is 13321212173. The reversal of 13321212161 is 16121212331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11292250225 + 2028961936 = 106265^2 + 45044^2 .

It is a cyclic number.

It is not a de Polignac number, because 13321212161 - 2¹⁴ = 13321195777 is a prime.

It is not a weakly prime, because it can be changed into another prime (13321212101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6660606080 + 6660606081.

It is an arithmetic number, because the mean of its divisors is an integer number (6660606081).

Almost surely, 2^13321212161 is an apocalyptic number.

It is an amenable number.

13321212161 is a deficient number, since it is larger than the sum of its proper divisors (1).

13321212161 is an equidigital number, since it uses as much as digits as its factorization.

13321212161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 23.

Adding to 13321212161 its reverse (16121212331), we get a palindrome (29442424492).

The spelling of 13321212161 in words is "thirteen billion, three hundred twenty-one million, two hundred twelve thousand, one hundred sixty-one".