1100221222181 has 2 divisors, whose sum is σ = 1100221222182. Its totient is φ = 1100221222180.

The previous prime is 1100221222171. The next prime is 1100221222241. The reversal of 1100221222181 is 1812221220011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 625443722500 + 474777499681 = 790850^2 + 689041^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100221222181 - 2⁶ = 1100221222117 is a prime.

It is a super-2 number, since 2×1100221222181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1100221222171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550110611090 + 550110611091.

It is an arithmetic number, because the mean of its divisors is an integer number (550110611091).

Almost surely, 2^{1100221222181} is an apocalyptic number.

It is an amenable number.

1100221222181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100221222181 is an equidigital number, since it uses as much as digits as its factorization.

1100221222181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 23.

Adding to 1100221222181 its reverse (1812221220011), we get a palindrome (2912442442192).

The spelling of 1100221222181 in words is "one trillion, one hundred billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred eighty-one".