4020321 has 4 divisors (see below), whose sum is σ = 5360432. Its totient is φ = 2680212.

The previous prime is 4020307. The next prime is 4020323. The reversal of 4020321 is 1230204.

4020321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 4020321 - 2⁶ = 4020257 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4020297 and 4020306.

It is not an unprimeable number, because it can be changed into a prime (4020323) 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 3 ways as a sum of consecutive naturals, for example, 670051 + ... + 670056.

It is an arithmetic number, because the mean of its divisors is an integer number (1340108).

Almost surely, 2^4020321 is an apocalyptic number.

It is an amenable number.

4020321 is a deficient number, since it is larger than the sum of its proper divisors (1340111).

4020321 is a wasteful number, since it uses less digits than its factorization.

4020321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340110.

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

The square root of 4020321 is about 2005.0738141026. The cubic root of 4020321 is about 159.0084644044.

Adding to 4020321 its reverse (1230204), we get a palindrome (5250525).

The spelling of 4020321 in words is "four million, twenty thousand, three hundred twenty-one".