224020221 has 8 divisors (see below), whose sum is σ = 302474880. Its totient is φ = 147456192.

The previous prime is 224020217. The next prime is 224020249. The reversal of 224020221 is 122020422.

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

It is not a de Polignac number, because 224020221 - 2² = 224020217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 224020221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (224020201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472380 + ... + 472853.

It is an arithmetic number, because the mean of its divisors is an integer number (37809360).

Almost surely, 2^224020221 is an apocalyptic number.

It is an amenable number.

224020221 is a deficient number, since it is larger than the sum of its proper divisors (78454659).

224020221 is an equidigital number, since it uses as much as digits as its factorization.

224020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945315.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 224020221 is about 14967.3050680475. The cubic root of 224020221 is about 607.3360684876.

Adding to 224020221 its reverse (122020422), we get a palindrome (346040643).

The spelling of 224020221 in words is "two hundred twenty-four million, twenty thousand, two hundred twenty-one".