424243221 has 16 divisors (see below), whose sum is σ = 581556864. Its totient is φ = 274895424.

The previous prime is 424243199. The next prime is 424243231. The reversal of 424243221 is 122342424.

It is not a de Polignac number, because 424243221 - 2⁷ = 424243093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 424243191 and 424243200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (424243231) 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, 170035 + ... + 172511.

It is an arithmetic number, because the mean of its divisors is an integer number (36347304).

Almost surely, 2^424243221 is an apocalyptic number.

It is an amenable number.

424243221 is a deficient number, since it is larger than the sum of its proper divisors (157313643).

424243221 is a wasteful number, since it uses less digits than its factorization.

424243221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060.

The product of its digits is 3072, while the sum is 24.

The square root of 424243221 is about 20597.1653632241. The cubic root of 424243221 is about 751.4007723758.

Adding to 424243221 its reverse (122342424), we get a palindrome (546585645).

The spelling of 424243221 in words is "four hundred twenty-four million, two hundred forty-three thousand, two hundred twenty-one".