171169838221 has 4 divisors (see below), whose sum is σ = 181238652252. Its totient is φ = 161101024192.

The previous prime is 171169838159. The next prime is 171169838237. The reversal of 171169838221 is 122838961171.

171169838221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122838961171 = 97 ⋅1266381043.

It can be written as a sum of positive squares in 2 ways, for example, as 100086813225 + 71083024996 = 316365^2 + 266614^2 .

It is a cyclic number.

It is not a de Polignac number, because 171169838221 - 2¹⁹ = 171169313933 is a prime.

It is a super-2 number, since 2×171169838221² (a number of 23 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 (171169838251) 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, 5034406990 + ... + 5034407023.

It is an arithmetic number, because the mean of its divisors is an integer number (45309663063).

Almost surely, 2^171169838221 is an apocalyptic number.

It is an amenable number.

171169838221 is a deficient number, since it is larger than the sum of its proper divisors (10068814031).

171169838221 is a wasteful number, since it uses less digits than its factorization.

171169838221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10068814030.

The product of its digits is 290304, while the sum is 49.

The spelling of 171169838221 in words is "one hundred seventy-one billion, one hundred sixty-nine million, eight hundred thirty-eight thousand, two hundred twenty-one".