11212012222261 has 2 divisors, whose sum is σ = 11212012222262. Its totient is φ = 11212012222260.

The previous prime is 11212012222181. The next prime is 11212012222289. The reversal of 11212012222261 is 16222221021211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10392273927025 + 819738295236 = 3223705^2 + 905394^2 .

It is a cyclic number.

It is not a de Polignac number, because 11212012222261 - 2⁹ = 11212012221749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11212012222661) 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, 5606006111130 + 5606006111131.

It is an arithmetic number, because the mean of its divisors is an integer number (5606006111131).

Almost surely, 2^{11212012222261} is an apocalyptic number.

It is an amenable number.

11212012222261 is a deficient number, since it is larger than the sum of its proper divisors (1).

11212012222261 is an equidigital number, since it uses as much as digits as its factorization.

11212012222261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 25.

Adding to 11212012222261 its reverse (16222221021211), we get a palindrome (27434233243472).

The spelling of 11212012222261 in words is "eleven trillion, two hundred twelve billion, twelve million, two hundred twenty-two thousand, two hundred sixty-one".