4052021 has 2 divisors, whose sum is σ = 4052022. Its totient is φ = 4052020.

The previous prime is 4051991. The next prime is 4052029. The reversal of 4052021 is 1202504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2283121 + 1768900 = 1511^2 + 1330^2 .

It is a cyclic number.

It is not a de Polignac number, because 4052021 - 2¹⁰ = 4050997 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 4051987 and 4052005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4052029) 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, 2026010 + 2026011.

It is an arithmetic number, because the mean of its divisors is an integer number (2026011).

Almost surely, 2^4052021 is an apocalyptic number.

It is an amenable number.

4052021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4052021 is an equidigital number, since it uses as much as digits as its factorization.

4052021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 4052021 is about 2012.9632386112. The cubic root of 4052021 is about 159.4252949556.

Adding to 4052021 its reverse (1202504), we get a palindrome (5254525).

The spelling of 4052021 in words is "four million, fifty-two thousand, twenty-one".