805021 has 8 divisors (see below), whose sum is σ = 939200. Its totient is φ = 689724.

The previous prime is 805019. The next prime is 805027. The reversal of 805021 is 120508.

It is a happy number.

It is not a de Polignac number, because 805021 - 2¹ = 805019 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 804986 and 805004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805027) 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, 831 + ... + 1516.

It is an arithmetic number, because the mean of its divisors is an integer number (117400).

2⁸⁰⁵⁰²¹ is an apocalyptic number.

It is an amenable number.

805021 is a deficient number, since it is larger than the sum of its proper divisors (134179).

805021 is an equidigital number, since it uses as much as digits as its factorization.

805021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2368 (or 2354 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 805021 is about 897.2296250125. The cubic root of 805021 is about 93.0255835886.

Adding to 805021 its reverse (120508), we get a palindrome (925529).

The spelling of 805021 in words is "eight hundred five thousand, twenty-one".