12441221 has 8 divisors (see below), whose sum is σ = 13550040. Its totient is φ = 11354112.

The previous prime is 12441217. The next prime is 12441223. The reversal of 12441221 is 12214421.

12441221 = 329² + 330² + ... + 417².

It can be written as a sum of positive squares in 4 ways, for example, as 1144900 + 11296321 = 1070^2 + 3361^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12441221 - 2² = 12441217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12441221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12441223) 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, 4220 + ... + 6533.

It is an arithmetic number, because the mean of its divisors is an integer number (1693755).

Almost surely, 2^12441221 is an apocalyptic number.

It is an amenable number.

12441221 is a deficient number, since it is larger than the sum of its proper divisors (1108819).

12441221 is a wasteful number, since it uses less digits than its factorization.

12441221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10855.

The product of its digits is 128, while the sum is 17.

The square root of 12441221 is about 3527.2115048576. The cubic root of 12441221 is about 231.7150993977.

Adding to 12441221 its reverse (12214421), we get a palindrome (24655642).

The spelling of 12441221 in words is "twelve million, four hundred forty-one thousand, two hundred twenty-one".