2004043021 has 2 divisors, whose sum is σ = 2004043022. Its totient is φ = 2004043020.

The previous prime is 2004043003. The next prime is 2004043091. The reversal of 2004043021 is 1203404002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2001578121 + 2464900 = 44739^2 + 1570^2 .

It is a cyclic number.

It is not a de Polignac number, because 2004043021 - 2⁷ = 2004042893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2004042986 and 2004043004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2004043001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1002021510 + 1002021511.

It is an arithmetic number, because the mean of its divisors is an integer number (1002021511).

Almost surely, 2^2004043021 is an apocalyptic number.

It is an amenable number.

2004043021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2004043021 is an equidigital number, since it uses as much as digits as its factorization.

2004043021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 2004043021 is about 44766.5390777532. The cubic root of 2004043021 is about 1260.7694596722.

Adding to 2004043021 its reverse (1203404002), we get a palindrome (3207447023).

The spelling of 2004043021 in words is "two billion, four million, forty-three thousand, twenty-one".