801021 has 32 divisors (see below), whose sum is σ = 1290240. Its totient is φ = 437184.

The previous prime is 801019. The next prime is 801037. The reversal of 801021 is 120108.

It is a happy number.

It is not a de Polignac number, because 801021 - 2¹ = 801019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 800988 and 801006.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 801021.

It is not an unprimeable number, because it can be changed into a prime (801001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17020 + ... + 17066.

It is an arithmetic number, because the mean of its divisors is an integer number (40320).

2⁸⁰¹⁰²¹ is an apocalyptic number.

It is an amenable number.

801021 is a deficient number, since it is larger than the sum of its proper divisors (489219).

801021 is a wasteful number, since it uses less digits than its factorization.

801021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 801021 is about 894.9977653603. The cubic root of 801021 is about 92.8712520685.

Adding to 801021 its reverse (120108), we get a palindrome (921129).

The spelling of 801021 in words is "eight hundred one thousand, twenty-one".