213520205 has 4 divisors (see below), whose sum is σ = 256224252. Its totient is φ = 170816160.

The previous prime is 213520193. The next prime is 213520207. The reversal of 213520205 is 502025312.

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 90288004 + 123232201 = 9502^2 + 11101^2 .

It is not a de Polignac number, because 213520205 - 2⁴ = 213520189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213520207) 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, 21352016 + ... + 21352025.

It is an arithmetic number, because the mean of its divisors is an integer number (64056063).

Almost surely, 2^213520205 is an apocalyptic number.

It is an amenable number.

213520205 is a deficient number, since it is larger than the sum of its proper divisors (42704047).

213520205 is an equidigital number, since it uses as much as digits as its factorization.

213520205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42704046.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 213520205 is about 14612.3305807116. The cubic root of 213520205 is about 597.6950502012.

Adding to 213520205 its reverse (502025312), we get a palindrome (715545517).

The spelling of 213520205 in words is "two hundred thirteen million, five hundred twenty thousand, two hundred five".