212105 has 8 divisors (see below), whose sum is σ = 259200. Its totient is φ = 166576.

The previous prime is 212099. The next prime is 212117. The reversal of 212105 is 501212.

212105 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212105 - 2¹² = 208009 is a prime.

It is an alternating number because its digits alternate between even and odd.

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, 65 + ... + 654.

It is an arithmetic number, because the mean of its divisors is an integer number (32400).

2²¹²¹⁰⁵ is an apocalyptic number.

It is an amenable number.

212105 is a deficient number, since it is larger than the sum of its proper divisors (47095).

212105 is an equidigital number, since it uses as much as digits as its factorization.

212105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 212105 is about 460.5485859277. The cubic root of 212105 is about 59.6371620856.

Adding to 212105 its reverse (501212), we get a palindrome (713317).

The spelling of 212105 in words is "two hundred twelve thousand, one hundred five".