4022021 has 2 divisors, whose sum is σ = 4022022. Its totient is φ = 4022020.

The previous prime is 4022017. The next prime is 4022027. The reversal of 4022021 is 1202204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3940225 + 81796 = 1985^2 + 286^2 .

It is a cyclic number.

It is not a de Polignac number, because 4022021 - 2² = 4022017 is a prime.

It is a Chen prime.

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 4021993 and 4022011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4022027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2011010 + 2011011.

It is an arithmetic number, because the mean of its divisors is an integer number (2011011).

Almost surely, 2^4022021 is an apocalyptic number.

It is an amenable number.

4022021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4022021 is an equidigital number, since it uses as much as digits as its factorization.

4022021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 4022021 is about 2005.4976938406. The cubic root of 4022021 is about 159.0308735850.

Adding to 4022021 its reverse (1202204), we get a palindrome (5224225).

The spelling of 4022021 in words is "four million, twenty-two thousand, twenty-one".