111020211022181 has 2 divisors, whose sum is σ = 111020211022182. Its totient is φ = 111020211022180.

The previous prime is 111020211022169. The next prime is 111020211022247. The reversal of 111020211022181 is 181220112020111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105392090584225 + 5628120437956 = 10266065^2 + 2372366^2 .

It is a cyclic number.

It is not a de Polignac number, because 111020211022181 - 2¹⁴ = 111020211005797 is a prime.

It is a super-2 number, since 2×111020211022181² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111020211022481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55510105511090 + 55510105511091.

It is an arithmetic number, because the mean of its divisors is an integer number (55510105511091).

Almost surely, 2^{111020211022181} is an apocalyptic number.

It is an amenable number.

111020211022181 is a deficient number, since it is larger than the sum of its proper divisors (1).

111020211022181 is an equidigital number, since it uses as much as digits as its factorization.

111020211022181 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 111020211022181 its reverse (181220112020111), we get a palindrome (292240323042292).

The spelling of 111020211022181 in words is "one hundred eleven trillion, twenty billion, two hundred eleven million, twenty-two thousand, one hundred eighty-one".