12122321161 has 2 divisors, whose sum is σ = 12122321162. Its totient is φ = 12122321160.

The previous prime is 12122321153. The next prime is 12122321171. The reversal of 12122321161 is 16112322121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6490719225 + 5631601936 = 80565^2 + 75044^2 .

It is a cyclic number.

It is not a de Polignac number, because 12122321161 - 2³ = 12122321153 is a prime.

It is not a weakly prime, because it can be changed into another prime (12122321171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061160580 + 6061160581.

It is an arithmetic number, because the mean of its divisors is an integer number (6061160581).

Almost surely, 2^12122321161 is an apocalyptic number.

It is an amenable number.

12122321161 is a deficient number, since it is larger than the sum of its proper divisors (1).

12122321161 is an equidigital number, since it uses as much as digits as its factorization.

12122321161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 22.

Adding to 12122321161 its reverse (16112322121), we get a palindrome (28234643282).

The spelling of 12122321161 in words is "twelve billion, one hundred twenty-two million, three hundred twenty-one thousand, one hundred sixty-one".