18110111212201 has 2 divisors, whose sum is σ = 18110111212202. Its totient is φ = 18110111212200.

The previous prime is 18110111212181. The next prime is 18110111212213. The reversal of 18110111212201 is 10221211101181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17865635354176 + 244475858025 = 4226776^2 + 494445^2 .

It is an emirp because it is prime and its reverse (10221211101181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18110111212201 - 2²⁹ = 18109574341289 is a prime.

It is a super-2 number, since 2×18110111212201² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18110111216201) 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, 9055055606100 + 9055055606101.

It is an arithmetic number, because the mean of its divisors is an integer number (9055055606101).

Almost surely, 2^{18110111212201} is an apocalyptic number.

It is an amenable number.

18110111212201 is a deficient number, since it is larger than the sum of its proper divisors (1).

18110111212201 is an equidigital number, since it uses as much as digits as its factorization.

18110111212201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 22.

Adding to 18110111212201 its reverse (10221211101181), we get a palindrome (28331322313382).

The spelling of 18110111212201 in words is "eighteen trillion, one hundred ten billion, one hundred eleven million, two hundred twelve thousand, two hundred one".