224221321 has 4 divisors (see below), whose sum is σ = 225517572. Its totient is φ = 222925072.

The previous prime is 224221271. The next prime is 224221331. The reversal of 224221321 is 123122422.

224221321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 95648400 + 128572921 = 9780^2 + 11339^2 .

It is a cyclic number.

It is not a de Polignac number, because 224221321 - 2¹⁷ = 224090249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (224221331) 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, 647866 + ... + 648211.

It is an arithmetic number, because the mean of its divisors is an integer number (56379393).

Almost surely, 2^224221321 is an apocalyptic number.

It is an amenable number.

224221321 is a deficient number, since it is larger than the sum of its proper divisors (1296251).

224221321 is a wasteful number, since it uses less digits than its factorization.

224221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296250.

The product of its digits is 384, while the sum is 19.

The square root of 224221321 is about 14974.0215373159. The cubic root of 224221321 is about 607.5177466633.

Adding to 224221321 its reverse (123122422), we get a palindrome (347343743).

The spelling of 224221321 in words is "two hundred twenty-four million, two hundred twenty-one thousand, three hundred twenty-one".