4543221 has 4 divisors (see below), whose sum is σ = 6057632. Its totient is φ = 3028812.

The previous prime is 4543207. The next prime is 4543237. The reversal of 4543221 is 1223454.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 4543221 - 2²² = 348917 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4543241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757201 + ... + 757206.

It is an arithmetic number, because the mean of its divisors is an integer number (1514408).

Almost surely, 2^4543221 is an apocalyptic number.

It is an amenable number.

4543221 is a deficient number, since it is larger than the sum of its proper divisors (1514411).

4543221 is a wasteful number, since it uses less digits than its factorization.

4543221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1514410.

The product of its digits is 960, while the sum is 21.

The square root of 4543221 is about 2131.4832863525. The cubic root of 4543221 is about 165.6232443625.

Adding to 4543221 its reverse (1223454), we get a palindrome (5766675).

The spelling of 4543221 in words is "four million, five hundred forty-three thousand, two hundred twenty-one".