171321 has 4 divisors (see below), whose sum is σ = 228432. Its totient is φ = 114212.

The previous prime is 171317. The next prime is 171329. The reversal of 171321 is 123171.

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, and also an emirpimes, since its reverse is a distinct semiprime: 123171 = 3 ⋅41057.

It is a cyclic number.

It is not a de Polignac number, because 171321 - 2² = 171317 is a prime.

It is a D-number.

171321 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 171321.

It is not an unprimeable number, because it can be changed into a prime (171329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28551 + ... + 28556.

It is an arithmetic number, because the mean of its divisors is an integer number (57108).

2¹⁷¹³²¹ is an apocalyptic number.

It is an amenable number.

171321 is a deficient number, since it is larger than the sum of its proper divisors (57111).

171321 is an equidigital number, since it uses as much as digits as its factorization.

171321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57110.

The product of its digits is 42, while the sum is 15.

The square root of 171321 is about 413.9094103786. The cubic root of 171321 is about 55.5397005126.

Adding to 171321 its reverse (123171), we get a palindrome (294492).

The spelling of 171321 in words is "one hundred seventy-one thousand, three hundred twenty-one", and thus it is an iban number.