11212012222181 has 2 divisors, whose sum is σ = 11212012222182. Its totient is φ = 11212012222180.

The previous prime is 11212012222163. The next prime is 11212012222261. The reversal of 11212012222181 is 18122221021211.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9190198393156 + 2021813829025 = 3031534^2 + 1421905^2 .

It is a cyclic number.

It is not a de Polignac number, because 11212012222181 - 2²² = 11212008027877 is a prime.

It is a super-3 number, since 3×11212012222181³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 11212012222181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11212012282181) 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, 5606006111090 + 5606006111091.

It is an arithmetic number, because the mean of its divisors is an integer number (5606006111091).

Almost surely, 2^{11212012222181} is an apocalyptic number.

It is an amenable number.

11212012222181 is a deficient number, since it is larger than the sum of its proper divisors (1).

11212012222181 is an equidigital number, since it uses as much as digits as its factorization.

11212012222181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 26.

Adding to 11212012222181 its reverse (18122221021211), we get a palindrome (29334233243392).

The spelling of 11212012222181 in words is "eleven trillion, two hundred twelve billion, twelve million, two hundred twenty-two thousand, one hundred eighty-one".