42171 has 4 divisors (see below), whose sum is σ = 56232. Its totient is φ = 28112.

The previous prime is 42169. The next prime is 42179. The reversal of 42171 is 17124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42171 - 2¹ = 42169 is a prime.

It is a D-number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 42171.

It is not an unprimeable number, because it can be changed into a prime (42179) 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, 7026 + ... + 7031.

It is an arithmetic number, because the mean of its divisors is an integer number (14058).

2⁴²¹⁷¹ is an apocalyptic number.

42171 is a deficient number, since it is larger than the sum of its proper divisors (14061).

42171 is a wasteful number, since it uses less digits than its factorization.

42171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14060.

The product of its digits is 56, while the sum is 15.

The square root of 42171 is about 205.3557888154. The cubic root of 42171 is about 34.8073772179.

Adding to 42171 its reverse (17124), we get a palindrome (59295).

The spelling of 42171 in words is "forty-two thousand, one hundred seventy-one", and thus it is an iban number.