12321321161 has 2 divisors, whose sum is σ = 12321321162. Its totient is φ = 12321321160.

The previous prime is 12321321139. The next prime is 12321321193. The reversal of 12321321161 is 16112312321.

12321321161 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., 9456395536 + 2864925625 = 97244^2 + 53525^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12321321161 is a prime.

It is not a weakly prime, because it can be changed into another prime (12321321361) 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, 6160660580 + 6160660581.

It is an arithmetic number, because the mean of its divisors is an integer number (6160660581).

Almost surely, 2^12321321161 is an apocalyptic number.

It is an amenable number.

12321321161 is a deficient number, since it is larger than the sum of its proper divisors (1).

12321321161 is an equidigital number, since it uses as much as digits as its factorization.

12321321161 is an odious number, because the sum of its binary digits is odd.

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

Adding to 12321321161 its reverse (16112312321), we get a palindrome (28433633482).

The spelling of 12321321161 in words is "twelve billion, three hundred twenty-one million, three hundred twenty-one thousand, one hundred sixty-one".