12205205 has 4 divisors (see below), whose sum is σ = 14646252. Its totient is φ = 9764160.

The previous prime is 12205181. The next prime is 12205213. The reversal of 12205205 is 50250221.

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 1387684 + 10817521 = 1178^2 + 3289^2 .

It is not a de Polignac number, because 12205205 - 2²² = 8010901 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a zygodrome in base 15.

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, 1220516 + ... + 1220525.

It is an arithmetic number, because the mean of its divisors is an integer number (3661563).

Almost surely, 2^12205205 is an apocalyptic number.

It is an amenable number.

12205205 is a deficient number, since it is larger than the sum of its proper divisors (2441047).

12205205 is an equidigital number, since it uses as much as digits as its factorization.

12205205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2441046.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 12205205 is about 3493.5948534425. The cubic root of 12205205 is about 230.2404857030.

Adding to 12205205 its reverse (50250221), we get a palindrome (62455426).

The spelling of 12205205 in words is "twelve million, two hundred five thousand, two hundred five".