224221213 has 4 divisors (see below), whose sum is σ = 224255488. Its totient is φ = 224186940.

The previous prime is 224221199. The next prime is 224221241. The reversal of 224221213 is 312122422.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-224221213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (224221253) 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, 3933 + ... + 21538.

It is an arithmetic number, because the mean of its divisors is an integer number (56063872).

Almost surely, 2^224221213 is an apocalyptic number.

It is an amenable number.

224221213 is a deficient number, since it is larger than the sum of its proper divisors (34275).

224221213 is an equidigital number, since it uses as much as digits as its factorization.

224221213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34274.

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

The square root of 224221213 is about 14974.0179310698. The cubic root of 224221213 is about 607.5176491229.

Adding to 224221213 its reverse (312122422), we get a palindrome (536343635).

The spelling of 224221213 in words is "two hundred twenty-four million, two hundred twenty-one thousand, two hundred thirteen".