4820021 has 2 divisors, whose sum is σ = 4820022. Its totient is φ = 4820020.

The previous prime is 4820009. The next prime is 4820033. The reversal of 4820021 is 1200284.

4820021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (4820009) and next prime (4820033).

It can be written as a sum of positive squares in only one way, i.e., 4774225 + 45796 = 2185^2 + 214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4820021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4820051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2410010 + 2410011.

It is an arithmetic number, because the mean of its divisors is an integer number (2410011).

Almost surely, 2^4820021 is an apocalyptic number.

It is an amenable number.

4820021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4820021 is an equidigital number, since it uses as much as digits as its factorization.

4820021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 4820021 is about 2195.4546226238. The cubic root of 4820021 is about 168.9207405844.

The spelling of 4820021 in words is "four million, eight hundred twenty thousand, twenty-one".