12121202161 has 2 divisors, whose sum is σ = 12121202162. Its totient is φ = 12121202160.

The previous prime is 12121202087. The next prime is 12121202167. The reversal of 12121202161 is 16120212121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11240240400 + 880961761 = 106020^2 + 29681^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121202161 - 2⁹ = 12121201649 is a prime.

It is not a weakly prime, because it can be changed into another prime (12121202167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060601080 + 6060601081.

It is an arithmetic number, because the mean of its divisors is an integer number (6060601081).

Almost surely, 2^12121202161 is an apocalyptic number.

It is an amenable number.

12121202161 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121202161 is an equidigital number, since it uses as much as digits as its factorization.

12121202161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 12121202161 its reverse (16120212121), we get a palindrome (28241414282).

The spelling of 12121202161 in words is "twelve billion, one hundred twenty-one million, two hundred two thousand, one hundred sixty-one".