171421 has 8 divisors (see below), whose sum is σ = 181944. Its totient is φ = 161280.

The previous prime is 171403. The next prime is 171427. The reversal of 171421 is 124171.

It can be written as a sum of positive squares in 4 ways, for example, as 25 + 171396 = 5^2 + 414^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 171421 - 2⁷ = 171293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 171395 and 171404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1461 + ... + 1573.

It is an arithmetic number, because the mean of its divisors is an integer number (22743).

2¹⁷¹⁴²¹ is an apocalyptic number.

It is an amenable number.

171421 is a deficient number, since it is larger than the sum of its proper divisors (10523).

171421 is a wasteful number, since it uses less digits than its factorization.

171421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191.

The product of its digits is 56, while the sum is 16.

The square root of 171421 is about 414.0301921358. The cubic root of 171421 is about 55.5505045778.

Subtracting from 171421 its sum of digits (16), we obtain a triangular number (171405 = T₅₈₅).

Adding to 171421 its reverse (124171), we get a palindrome (295592).

The spelling of 171421 in words is "one hundred seventy-one thousand, four hundred twenty-one", and thus it is an iban number.