2042021 has 2 divisors, whose sum is σ = 2042022. Its totient is φ = 2042020.

The previous prime is 2042017. The next prime is 2042039. The reversal of 2042021 is 1202402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1240996 + 801025 = 1114^2 + 895^2 .

It is a cyclic number.

It is not a de Polignac number, because 2042021 - 2² = 2042017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2041993 and 2042011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2042221) 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, 1021010 + 1021011.

It is an arithmetic number, because the mean of its divisors is an integer number (1021011).

2^2042021 is an apocalyptic number.

It is an amenable number.

2042021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2042021 is an equidigital number, since it uses as much as digits as its factorization.

2042021 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 2042021 is about 1428.9930020822. The cubic root of 2042021 is about 126.8683820470.

Adding to 2042021 its reverse (1202402), we get a palindrome (3244423).

The spelling of 2042021 in words is "two million, forty-two thousand, twenty-one".