1109168042221 has 4 divisors (see below), whose sum is σ = 1109170511100. Its totient is φ = 1109165573344.

The previous prime is 1109168042197. The next prime is 1109168042231. The reversal of 1109168042221 is 1222408619011.

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 795583722025 + 313584320196 = 891955^2 + 559986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1109168042221 - 2⁵ = 1109168042189 is a prime.

It is a super-2 number, since 2×1109168042221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1109168042231) 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, 348706 + ... + 1529683.

It is an arithmetic number, because the mean of its divisors is an integer number (277292627775).

Almost surely, 2^{1109168042221} is an apocalyptic number.

It is an amenable number.

1109168042221 is a deficient number, since it is larger than the sum of its proper divisors (2468879).

1109168042221 is an equidigital number, since it uses as much as digits as its factorization.

1109168042221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2468878.

The product of its (nonzero) digits is 13824, while the sum is 37.

The spelling of 1109168042221 in words is "one trillion, one hundred nine billion, one hundred sixty-eight million, forty-two thousand, two hundred twenty-one".