4282021 has 2 divisors, whose sum is σ = 4282022. Its totient is φ = 4282020.

The previous prime is 4282013. The next prime is 4282027. The reversal of 4282021 is 1202824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2604996 + 1677025 = 1614^2 + 1295^2 .

It is a cyclic number.

It is not a de Polignac number, because 4282021 - 2³ = 4282013 is a prime.

It is a Chen prime.

4282021 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 4282021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4282027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2141010 + 2141011.

It is an arithmetic number, because the mean of its divisors is an integer number (2141011).

Almost surely, 2^4282021 is an apocalyptic number.

It is an amenable number.

4282021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4282021 is an equidigital number, since it uses as much as digits as its factorization.

4282021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 4282021 is about 2069.3044725221. The cubic root of 4282021 is about 162.3863789566.

Adding to 4282021 its reverse (1202824), we get a palindrome (5484845).

The spelling of 4282021 in words is "four million, two hundred eighty-two thousand, twenty-one".