2171005 has 4 divisors (see below), whose sum is σ = 2605212. Its totient is φ = 1736800.

The previous prime is 2171003. The next prime is 2171011. The reversal of 2171005 is 5001712.

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 1196836 + 974169 = 1094^2 + 987^2 .

It is not a de Polignac number, because 2171005 - 2¹ = 2171003 is a prime.

It is a super-3 number, since 3×2171005³ = 30697550729333475375, which contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2171005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171003) 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, 217096 + ... + 217105.

It is an arithmetic number, because the mean of its divisors is an integer number (651303).

2^2171005 is an apocalyptic number.

It is an amenable number.

2171005 is a deficient number, since it is larger than the sum of its proper divisors (434207).

2171005 is an equidigital number, since it uses as much as digits as its factorization.

2171005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434206.

The product of its (nonzero) digits is 70, while the sum is 16.

The square root of 2171005 is about 1473.4330660061. The cubic root of 2171005 is about 129.4852425256.

Adding to 2171005 its reverse (5001712), we get a palindrome (7172717).

The spelling of 2171005 in words is "two million, one hundred seventy-one thousand, five".