213211205 has 8 divisors (see below), whose sum is σ = 262768632. Its totient is φ = 165958848.

The previous prime is 213211169. The next prime is 213211213. The reversal of 213211205 is 502112312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 108701476 + 104509729 = 10426^2 + 10223^2 .

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 213211205 - 2¹⁰ = 213210181 is a prime.

It is a Duffinian number.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 576062 + ... + 576431.

It is an arithmetic number, because the mean of its divisors is an integer number (32846079).

Almost surely, 2^213211205 is an apocalyptic number.

It is an amenable number.

213211205 is a deficient number, since it is larger than the sum of its proper divisors (49557427).

213211205 is a wasteful number, since it uses less digits than its factorization.

213211205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152535.

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

The square root of 213211205 is about 14601.7534905915. The cubic root of 213211205 is about 597.4065889230.

Adding to 213211205 its reverse (502112312), we get a palindrome (715323517).

The spelling of 213211205 in words is "two hundred thirteen million, two hundred eleven thousand, two hundred five".