224242221 has 16 divisors (see below), whose sum is σ = 342007424. Its totient is φ = 128024064.

The previous prime is 224242219. The next prime is 224242231. The reversal of 224242221 is 122242422.

It is not a de Polignac number, because 224242221 - 2¹ = 224242219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (224242201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23121 + ... + 31353.

It is an arithmetic number, because the mean of its divisors is an integer number (21375464).

Almost surely, 2^224242221 is an apocalyptic number.

224242221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

224242221 is a deficient number, since it is larger than the sum of its proper divisors (117765203).

224242221 is a wasteful number, since it uses less digits than its factorization.

224242221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9540.

The product of its digits is 1024, while the sum is 21.

The square root of 224242221 is about 14974.7193963693. The cubic root of 224242221 is about 607.5366219519.

Adding to 224242221 its reverse (122242422), we get a palindrome (346484643).

The spelling of 224242221 in words is "two hundred twenty-four million, two hundred forty-two thousand, two hundred twenty-one".