12211320161 has 2 divisors, whose sum is σ = 12211320162. Its totient is φ = 12211320160.

The previous prime is 12211320139. The next prime is 12211320169. The reversal of 12211320161 is 16102311221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6409603600 + 5801716561 = 80060^2 + 76169^2 .

It is an emirp because it is prime and its reverse (16102311221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12211320161 - 2¹⁴ = 12211303777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12211320169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105660080 + 6105660081.

It is an arithmetic number, because the mean of its divisors is an integer number (6105660081).

Almost surely, 2^12211320161 is an apocalyptic number.

It is an amenable number.

12211320161 is a deficient number, since it is larger than the sum of its proper divisors (1).

12211320161 is an equidigital number, since it uses as much as digits as its factorization.

12211320161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 12211320161 its reverse (16102311221), we get a palindrome (28313631382).

The spelling of 12211320161 in words is "twelve billion, two hundred eleven million, three hundred twenty thousand, one hundred sixty-one".