210006205 has 4 divisors (see below), whose sum is σ = 252007452. Its totient is φ = 168004960.

The previous prime is 210006187. The next prime is 210006211. The reversal of 210006205 is 502600012.

It is a happy number.

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 139546969 + 70459236 = 11813^2 + 8394^2 .

It is not a de Polignac number, because 210006205 - 2⁹ = 210005693 is a prime.

It is a super-2 number, since 2×210006205² = 88205212277004050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21000616 + ... + 21000625.

It is an arithmetic number, because the mean of its divisors is an integer number (63001863).

Almost surely, 2^210006205 is an apocalyptic number.

It is an amenable number.

210006205 is a deficient number, since it is larger than the sum of its proper divisors (42001247).

210006205 is an equidigital number, since it uses as much as digits as its factorization.

210006205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42001246.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 210006205 is about 14491.5908374478. The cubic root of 210006205 is about 594.3980495100.

Adding to 210006205 its reverse (502600012), we get a palindrome (712606217).

The spelling of 210006205 in words is "two hundred ten million, six thousand, two hundred five".