80008021 has 4 divisors (see below), whose sum is σ = 80035200. Its totient is φ = 79980844.

The previous prime is 80008009. The next prime is 80008051. The reversal of 80008021 is 12080008.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 80008021 - 2⁵ = 80007989 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 80008021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80008051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8551 + ... + 15268.

It is an arithmetic number, because the mean of its divisors is an integer number (20008800).

Almost surely, 2^80008021 is an apocalyptic number.

It is an amenable number.

80008021 is a deficient number, since it is larger than the sum of its proper divisors (27179).

80008021 is a wasteful number, since it uses less digits than its factorization.

80008021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27178.

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

The square root of 80008021 is about 8944.7202862918. The cubic root of 80008021 is about 430.9013381257.

Adding to 80008021 its reverse (12080008), we get a palindrome (92088029).

The spelling of 80008021 in words is "eighty million, eight thousand, twenty-one".