424543221 has 8 divisors (see below), whose sum is σ = 628952960. Its totient is φ = 283028796.

The previous prime is 424543199. The next prime is 424543241. The reversal of 424543221 is 122345424.

It is not a de Polignac number, because 424543221 - 2²² = 420348917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 15723823 = 424543221 / (4 + 2 + 4 + 5 + 4 + 3 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (424543241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7861885 + ... + 7861938.

It is an arithmetic number, because the mean of its divisors is an integer number (78619120).

Almost surely, 2^424543221 is an apocalyptic number.

It is an amenable number.

424543221 is a deficient number, since it is larger than the sum of its proper divisors (204409739).

424543221 is a wasteful number, since it uses less digits than its factorization.

424543221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15723832 (or 15723826 counting only the distinct ones).

The product of its digits is 7680, while the sum is 27.

The square root of 424543221 is about 20604.4466317346. The cubic root of 424543221 is about 751.5778462073.

Adding to 424543221 its reverse (122345424), we get a palindrome (546888645).

The spelling of 424543221 in words is "four hundred twenty-four million, five hundred forty-three thousand, two hundred twenty-one".