8008021 has 16 divisors (see below), whose sum is σ = 9606400. Its totient is φ = 6667920.

The previous prime is 8008009. The next prime is 8008081. The reversal of 8008021 is 1208008.

8008021 = T₃₂₃ + T₃₂₄ + ... + T₄₃₃.

It is a happy number.

It is not a de Polignac number, because 8008021 - 2¹⁹ = 7483733 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8008021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8008081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12376 + ... + 13006.

It is an arithmetic number, because the mean of its divisors is an integer number (600400).

Almost surely, 2^8008021 is an apocalyptic number.

It is an amenable number.

8008021 is a deficient number, since it is larger than the sum of its proper divisors (1598379).

8008021 is an equidigital number, since it uses as much as digits as its factorization.

8008021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689 (or 675 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 8008021 is about 2829.8446953852. The cubic root of 8008021 is about 200.0668193401.

The spelling of 8008021 in words is "eight million, eight thousand, twenty-one".