11331222181 has 2 divisors, whose sum is σ = 11331222182. Its totient is φ = 11331222180.

The previous prime is 11331222127. The next prime is 11331222277. The reversal of 11331222181 is 18122213311.

11331222181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7363356100 + 3967866081 = 85810^2 + 62991^2 .

It is a cyclic number.

It is not a de Polignac number, because 11331222181 - 2¹⁵ = 11331189413 is a prime.

It is a super-2 number, since 2×11331222181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11331222121) 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, 5665611090 + 5665611091.

It is an arithmetic number, because the mean of its divisors is an integer number (5665611091).

Almost surely, 2^11331222181 is an apocalyptic number.

It is an amenable number.

11331222181 is a deficient number, since it is larger than the sum of its proper divisors (1).

11331222181 is an equidigital number, since it uses as much as digits as its factorization.

11331222181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 25.

Adding to 11331222181 its reverse (18122213311), we get a palindrome (29453435492).

The spelling of 11331222181 in words is "eleven billion, three hundred thirty-one million, two hundred twenty-two thousand, one hundred eighty-one".