213120205 has 4 divisors (see below), whose sum is σ = 255744252. Its totient is φ = 170496160.

The previous prime is 213120197. The next prime is 213120239. The reversal of 213120205 is 502021312.

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 125753796 + 87366409 = 11214^2 + 9347^2 .

It is not a de Polignac number, because 213120205 - 2³ = 213120197 is a prime.

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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21312016 + ... + 21312025.

It is an arithmetic number, because the mean of its divisors is an integer number (63936063).

Almost surely, 2^213120205 is an apocalyptic number.

It is an amenable number.

213120205 is a deficient number, since it is larger than the sum of its proper divisors (42624047).

213120205 is an equidigital number, since it uses as much as digits as its factorization.

213120205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42624046.

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

The square root of 213120205 is about 14598.6370939208. The cubic root of 213120205 is about 597.3215844229.

Adding to 213120205 its reverse (502021312), we get a palindrome (715141517).

The spelling of 213120205 in words is "two hundred thirteen million, one hundred twenty thousand, two hundred five".