12120212261 has 2 divisors, whose sum is σ = 12120212262. Its totient is φ = 12120212260.

The previous prime is 12120212213. The next prime is 12120212267. The reversal of 12120212261 is 16221202121.

12120212261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7342776100 + 4777436161 = 85690^2 + 69119^2 .

It is an emirp because it is prime and its reverse (16221202121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12120212261 - 2¹⁰ = 12120211237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12120212267) 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, 6060106130 + 6060106131.

It is an arithmetic number, because the mean of its divisors is an integer number (6060106131).

Almost surely, 2^12120212261 is an apocalyptic number.

It is an amenable number.

12120212261 is a deficient number, since it is larger than the sum of its proper divisors (1).

12120212261 is an equidigital number, since it uses as much as digits as its factorization.

12120212261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 12120212261 its reverse (16221202121), we get a palindrome (28341414382).

The spelling of 12120212261 in words is "twelve billion, one hundred twenty million, two hundred twelve thousand, two hundred sixty-one".