171200016221 has 4 divisors (see below), whose sum is σ = 184369248252. Its totient is φ = 158030784192.

The previous prime is 171200016217. The next prime is 171200016257. The reversal of 171200016221 is 122610002171.

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 86527164025 + 84672852196 = 294155^2 + 290986^2 .

It is a cyclic number.

It is not a de Polignac number, because 171200016221 - 2² = 171200016217 is a prime.

It is a super-3 number, since 3×171200016221³ (a number of 35 digits) contains 333 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 (171200016721) 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, 6584615996 + ... + 6584616021.

It is an arithmetic number, because the mean of its divisors is an integer number (46092312063).

Almost surely, 2^171200016221 is an apocalyptic number.

It is an amenable number.

171200016221 is a deficient number, since it is larger than the sum of its proper divisors (13169232031).

171200016221 is a wasteful number, since it uses less digits than its factorization.

171200016221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13169232030.

The product of its (nonzero) digits is 336, while the sum is 23.

Adding to 171200016221 its reverse (122610002171), we get a palindrome (293810018392).

The spelling of 171200016221 in words is "one hundred seventy-one billion, two hundred million, sixteen thousand, two hundred twenty-one".