2173121174161 has 4 divisors (see below), whose sum is σ = 2483567056192. Its totient is φ = 1862675292132.

The previous prime is 2173121174149. The next prime is 2173121174167. The reversal of 2173121174161 is 1614711213712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2173121174161 - 2¹⁷ = 2173121043089 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 2173121174161.

It is not an unprimeable number, because it can be changed into a prime (2173121174167) 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 in 3 ways as a sum of consecutive naturals, for example, 155222941005 + ... + 155222941018.

It is an arithmetic number, because the mean of its divisors is an integer number (620891764048).

Almost surely, 2^{2173121174161} is an apocalyptic number.

It is an amenable number.

2173121174161 is a deficient number, since it is larger than the sum of its proper divisors (310445882031).

2173121174161 is an equidigital number, since it uses as much as digits as its factorization.

2173121174161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310445882030.

The product of its digits is 14112, while the sum is 37.

Adding to 2173121174161 its reverse (1614711213712), we get a palindrome (3787832387873).

The spelling of 2173121174161 in words is "two trillion, one hundred seventy-three billion, one hundred twenty-one million, one hundred seventy-four thousand, one hundred sixty-one".