210106205 has 4 divisors (see below), whose sum is σ = 252127452. Its totient is φ = 168084960.

The previous prime is 210106201. The next prime is 210106249. The reversal of 210106205 is 502601012.

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 139310809 + 70795396 = 11803^2 + 8414^2 .

It is not a de Polignac number, because 210106205 - 2² = 210106201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210106201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21010616 + ... + 21010625.

It is an arithmetic number, because the mean of its divisors is an integer number (63031863).

Almost surely, 2^210106205 is an apocalyptic number.

It is an amenable number.

210106205 is a deficient number, since it is larger than the sum of its proper divisors (42021247).

210106205 is an equidigital number, since it uses as much as digits as its factorization.

210106205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42021246.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 210106205 is about 14495.0407036338. The cubic root of 210106205 is about 594.4923806479.

Adding to 210106205 its reverse (502601012), we get a palindrome (712707217).

The spelling of 210106205 in words is "two hundred ten million, one hundred six thousand, two hundred five".