4528021 has 2 divisors, whose sum is σ = 4528022. Its totient is φ = 4528020.

The previous prime is 4528019. The next prime is 4528087. The reversal of 4528021 is 1208254.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2992900 + 1535121 = 1730^2 + 1239^2 .

It is a cyclic number.

It is not a de Polignac number, because 4528021 - 2¹ = 4528019 is a prime.

Together with 4528019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 4527983 and 4528001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4528421) 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 as a sum of consecutive naturals, namely, 2264010 + 2264011.

It is an arithmetic number, because the mean of its divisors is an integer number (2264011).

Almost surely, 2^4528021 is an apocalyptic number.

It is an amenable number.

4528021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4528021 is an equidigital number, since it uses as much as digits as its factorization.

4528021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 4528021 is about 2127.9147069373. The cubic root of 4528021 is about 165.4383325223.

The spelling of 4528021 in words is "four million, five hundred twenty-eight thousand, twenty-one".