10004021 has 4 divisors (see below), whose sum is σ = 10010700. Its totient is φ = 9997344.

The previous prime is 10004017. The next prime is 10004039. The reversal of 10004021 is 12040001.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 579121 + 9424900 = 761^2 + 3070^2 .

It is a cyclic number.

It is not a de Polignac number, because 10004021 - 2² = 10004017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10004521) 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 in 3 ways as a sum of consecutive naturals, for example, 65 + ... + 4473.

It is an arithmetic number, because the mean of its divisors is an integer number (2502675).

Almost surely, 2^10004021 is an apocalyptic number.

It is an amenable number.

10004021 is a deficient number, since it is larger than the sum of its proper divisors (6679).

10004021 is an equidigital number, since it uses as much as digits as its factorization.

10004021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6678.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 10004021 is about 3162.9133721934. The cubic root of 10004021 is about 215.4723417399.

Adding to 10004021 its reverse (12040001), we get a palindrome (22044022).

The spelling of 10004021 in words is "ten million, four thousand, twenty-one".