111111111222101 has 4 divisors (see below), whose sum is σ = 111111802299372. Its totient is φ = 111110420144832.

The previous prime is 111111111222073. The next prime is 111111111222103. The reversal of 111111111222101 is 101222111111111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 86976234471025 + 24134876751076 = 9326105^2 + 4912726^2 .

It is a cyclic number.

It is not a de Polignac number, because 111111111222101 - 2³⁴ = 111093931352917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111111111222101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111111222103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345297410 + ... + 345619043.

It is an arithmetic number, because the mean of its divisors is an integer number (27777950574843).

Almost surely, 2^{111111111222101} is an apocalyptic number.

It is an amenable number.

111111111222101 is a deficient number, since it is larger than the sum of its proper divisors (691077271).

111111111222101 is an equidigital number, since it uses as much as digits as its factorization.

111111111222101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691077270.

The product of its (nonzero) digits is 8, while the sum is 17.

Adding to 111111111222101 its reverse (101222111111111), we get a palindrome (212333222333212).

The spelling of 111111111222101 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred eleven million, two hundred twenty-two thousand, one hundred one".