4320021 has 16 divisors (see below), whose sum is σ = 6067584. Its totient is φ = 2728704.

The previous prime is 4319993. The next prime is 4320059. The reversal of 4320021 is 1200234.

It is not a de Polignac number, because 4320021 - 2⁷ = 4319893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4319979 and 4320006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4320061) 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 15 ways as a sum of consecutive naturals, for example, 9225 + ... + 9681.

It is an arithmetic number, because the mean of its divisors is an integer number (379224).

Almost surely, 2^4320021 is an apocalyptic number.

It is an amenable number.

4320021 is a deficient number, since it is larger than the sum of its proper divisors (1747563).

4320021 is a wasteful number, since it uses less digits than its factorization.

4320021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 4320021 is about 2078.4660208914. The cubic root of 4320021 is about 162.8653208970.

Adding to 4320021 its reverse (1200234), we get a palindrome (5520255).

The spelling of 4320021 in words is "four million, three hundred twenty thousand, twenty-one".