4224021 has 4 divisors (see below), whose sum is σ = 5632032. Its totient is φ = 2816012.

The previous prime is 4223993. The next prime is 4224037. The reversal of 4224021 is 1204224.

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 a cyclic number.

It is not a de Polignac number, because 4224021 - 2⁹ = 4223509 is a prime.

It is a D-number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4229021) 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, 704001 + ... + 704006.

It is an arithmetic number, because the mean of its divisors is an integer number (1408008).

Almost surely, 2^4224021 is an apocalyptic number.

It is an amenable number.

4224021 is a deficient number, since it is larger than the sum of its proper divisors (1408011).

4224021 is a wasteful number, since it uses less digits than its factorization.

4224021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408010.

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

The square root of 4224021 is about 2055.2423214794. The cubic root of 4224021 is about 161.6498687097.

Adding to 4224021 its reverse (1204224), we get a palindrome (5428245).

The spelling of 4224021 in words is "four million, two hundred twenty-four thousand, twenty-one".