205216213 has 4 divisors (see below), whose sum is σ = 208027468. Its totient is φ = 202404960.

The previous prime is 205216211. The next prime is 205216217. The reversal of 205216213 is 312612502.

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 41964484 + 163251729 = 6478^2 + 12777^2 .

It is a cyclic number.

It is not a de Polignac number, because 205216213 - 2¹ = 205216211 is a prime.

It is a super-2 number, since 2×205216213² = 84227388156122738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205216211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1405518 + ... + 1405663.

It is an arithmetic number, because the mean of its divisors is an integer number (52006867).

Almost surely, 2^205216213 is an apocalyptic number.

It is an amenable number.

205216213 is a deficient number, since it is larger than the sum of its proper divisors (2811255).

205216213 is an equidigital number, since it uses as much as digits as its factorization.

205216213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2811254.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 205216213 is about 14325.3695589329. The cubic root of 205216213 is about 589.8440773454.

Adding to 205216213 its reverse (312612502), we get a palindrome (517828715).

The spelling of 205216213 in words is "two hundred five million, two hundred sixteen thousand, two hundred thirteen".