424221 has 8 divisors (see below), whose sum is σ = 646464. Its totient is φ = 242400.

The previous prime is 424199. The next prime is 424223. The reversal of 424221 is 122424.

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

It is not a de Polignac number, because 424221 - 2⁶ = 424157 is a prime.

It is a Smith number, since the sum of its digits (15) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

424221 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 424221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (424223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10080 + ... + 10121.

It is an arithmetic number, because the mean of its divisors is an integer number (80808).

2⁴²⁴²²¹ is an apocalyptic number.

It is an amenable number.

424221 is a deficient number, since it is larger than the sum of its proper divisors (222243).

424221 is a wasteful number, since it uses less digits than its factorization.

424221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20211.

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

The square root of 424221 is about 651.3225007629. The cubic root of 424221 is about 75.1387653197.

Adding to 424221 its reverse (122424), we get a palindrome (546645).

The spelling of 424221 in words is "four hundred twenty-four thousand, two hundred twenty-one", and thus it is an iban number.