210005 has 8 divisors (see below), whose sum is σ = 255192. Its totient is φ = 165888.

The previous prime is 209987. The next prime is 210011. The reversal of 210005 is 500012.

210005 is nontrivially palindromic in base 14.

210005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

210005 is an esthetic number in base 14, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in 4 ways, for example, as 1156 + 208849 = 34^2 + 457^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210005 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 209974 and 210001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269 + ... + 701.

It is an arithmetic number, because the mean of its divisors is an integer number (31899).

2²¹⁰⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

210005 is a deficient number, since it is larger than the sum of its proper divisors (45187).

210005 is an equidigital number, since it uses as much as digits as its factorization.

210005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535.

The product of its (nonzero) digits is 10, while the sum is 8.

The square root of 210005 is about 458.2630249104. The cubic root of 210005 is about 59.4396912637.

Adding to 210005 its reverse (500012), we get a palindrome (710017).

The spelling of 210005 in words is "two hundred ten thousand, five".