21122210011181 has 2 divisors, whose sum is σ = 21122210011182. Its totient is φ = 21122210011180.

The previous prime is 21122210011163. The next prime is 21122210011223. The reversal of 21122210011181 is 18111001222112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17207015681956 + 3915194329225 = 4148134^2 + 1978685^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122210011181 - 2¹⁰ = 21122210010157 is a prime.

It is a super-2 number, since 2×21122210011181² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21122210014181) 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, 10561105005590 + 10561105005591.

It is an arithmetic number, because the mean of its divisors is an integer number (10561105005591).

Almost surely, 2^{21122210011181} is an apocalyptic number.

It is an amenable number.

21122210011181 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122210011181 is an equidigital number, since it uses as much as digits as its factorization.

21122210011181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 23.

Adding to 21122210011181 its reverse (18111001222112), we get a palindrome (39233211233293).

The spelling of 21122210011181 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred ten million, eleven thousand, one hundred eighty-one".