807021 has 6 divisors (see below), whose sum is σ = 1165710. Its totient is φ = 538008.

The previous prime is 807017. The next prime is 807071. The reversal of 807021 is 120708.

It can be written as a sum of positive squares in only one way, i.e., 617796 + 189225 = 786^2 + 435^2 .

It is not a de Polignac number, because 807021 - 2² = 807017 is a prime.

It is a zygodrome in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 806985 and 807003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (807011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44826 + ... + 44843.

It is an arithmetic number, because the mean of its divisors is an integer number (194285).

2⁸⁰⁷⁰²¹ is an apocalyptic number.

It is an amenable number.

807021 is a deficient number, since it is larger than the sum of its proper divisors (358689).

807021 is a wasteful number, since it uses less digits than its factorization.

807021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89675 (or 89672 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 807021 is about 898.3434755148. The cubic root of 807021 is about 93.1025576898.

Adding to 807021 its reverse (120708), we get a palindrome (927729).

The spelling of 807021 in words is "eight hundred seven thousand, twenty-one".