4066021 has 2 divisors, whose sum is σ = 4066022. Its totient is φ = 4066020.

The previous prime is 4065989. The next prime is 4066031. The reversal of 4066021 is 1206604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4040100 + 25921 = 2010^2 + 161^2 .

It is a cyclic number.

It is not a de Polignac number, because 4066021 - 2⁵ = 4065989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4066021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4066031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2033010 + 2033011.

It is an arithmetic number, because the mean of its divisors is an integer number (2033011).

Almost surely, 2^4066021 is an apocalyptic number.

It is an amenable number.

4066021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4066021 is an equidigital number, since it uses as much as digits as its factorization.

4066021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 4066021 is about 2016.4377005006. The cubic root of 4066021 is about 159.6086922065.

The spelling of 4066021 in words is "four million, sixty-six thousand, twenty-one".