224040221 has 4 divisors (see below), whose sum is σ = 226350012. Its totient is φ = 221730432.

The previous prime is 224040209. The next prime is 224040233. The reversal of 224040221 is 122040422.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (224040209) and next prime (224040233).

It can be written as a sum of positive squares in 2 ways, for example, as 140683321 + 83356900 = 11861^2 + 9130^2 .

It is a cyclic number.

It is not a de Polignac number, because 224040221 - 2¹⁰ = 224039197 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 224040221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (224040281) 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, 1154750 + ... + 1154943.

It is an arithmetic number, because the mean of its divisors is an integer number (56587503).

Almost surely, 2^224040221 is an apocalyptic number.

It is an amenable number.

224040221 is a deficient number, since it is larger than the sum of its proper divisors (2309791).

224040221 is an equidigital number, since it uses as much as digits as its factorization.

224040221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2309790.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 224040221 is about 14967.9731760850. The cubic root of 224040221 is about 607.3541417965.

Adding to 224040221 its reverse (122040422), we get a palindrome (346080643).

The spelling of 224040221 in words is "two hundred twenty-four million, forty thousand, two hundred twenty-one".