12011022211261 has 2 divisors, whose sum is σ = 12011022211262. Its totient is φ = 12011022211260.

The previous prime is 12011022211163. The next prime is 12011022211297. The reversal of 12011022211261 is 16211222011021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11997952005636 + 13070205625 = 3463806^2 + 114325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12011022211261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12011022215261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6005511105630 + 6005511105631.

It is an arithmetic number, because the mean of its divisors is an integer number (6005511105631).

Almost surely, 2^{12011022211261} is an apocalyptic number.

It is an amenable number.

12011022211261 is a deficient number, since it is larger than the sum of its proper divisors (1).

12011022211261 is an equidigital number, since it uses as much as digits as its factorization.

12011022211261 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 22.

Adding to 12011022211261 its reverse (16211222011021), we get a palindrome (28222244222282).

The spelling of 12011022211261 in words is "twelve trillion, eleven billion, twenty-two million, two hundred eleven thousand, two hundred sixty-one".