802021 has 4 divisors (see below), whose sum is σ = 874944. Its totient is φ = 729100.

The previous prime is 802019. The next prime is 802027. The reversal of 802021 is 120208.

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 802021 - 2¹ = 802019 is a prime.

It is a Duffinian number.

802021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 801992 and 802010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (802027) 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, 36445 + ... + 36466.

It is an arithmetic number, because the mean of its divisors is an integer number (218736).

2⁸⁰²⁰²¹ is an apocalyptic number.

It is an amenable number.

802021 is a deficient number, since it is larger than the sum of its proper divisors (72923).

802021 is a wasteful number, since it uses less digits than its factorization.

802021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72922.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 802021 is about 895.5562517229. The cubic root of 802021 is about 92.9098830290.

Adding to 802021 its reverse (120208), we get a palindrome (922229).

The spelling of 802021 in words is "eight hundred two thousand, twenty-one".