12221205 has 8 divisors (see below), whose sum is σ = 19553952. Its totient is φ = 6517968.

The previous prime is 12221203. The next prime is 12221207. The reversal of 12221205 is 50212221.

It is an interprime number because it is at equal distance from previous prime (12221203) and next prime (12221207).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12221205 - 2¹ = 12221203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 814747 = 12221205 / (1 + 2 + 2 + 2 + 1 + 2 + 0 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 407359 + ... + 407388.

It is an arithmetic number, because the mean of its divisors is an integer number (2444244).

Almost surely, 2^12221205 is an apocalyptic number.

12221205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12221205 is a deficient number, since it is larger than the sum of its proper divisors (7332747).

12221205 is an equidigital number, since it uses as much as digits as its factorization.

12221205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814755.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 12221205 is about 3495.8840083733. The cubic root of 12221205 is about 230.3410504266.

Adding to 12221205 its reverse (50212221), we get a palindrome (62433426).

The spelling of 12221205 in words is "twelve million, two hundred twenty-one thousand, two hundred five".