8004021 has 8 divisors (see below), whose sum is σ = 10831584. Its totient is φ = 5256240.

The previous prime is 8004013. The next prime is 8004047. The reversal of 8004021 is 1204008.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8004021 - 2³ = 8004013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8004011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19710 + ... + 20111.

It is an arithmetic number, because the mean of its divisors is an integer number (1353948).

Almost surely, 2^8004021 is an apocalyptic number.

It is an amenable number.

8004021 is a deficient number, since it is larger than the sum of its proper divisors (2827563).

8004021 is a wasteful number, since it uses less digits than its factorization.

8004021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39891.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 8004021 is about 2829.1378545416. The cubic root of 8004021 is about 200.0335027209.

Adding to 8004021 its reverse (1204008), we get a palindrome (9208029).

The spelling of 8004021 in words is "eight million, four thousand, twenty-one".