828021 has 4 divisors (see below), whose sum is σ = 1104032. Its totient is φ = 552012.

The previous prime is 828013. The next prime is 828029. The reversal of 828021 is 120828.

828021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 an interprime number because it is at equal distance from previous prime (828013) and next prime (828029).

It is not a de Polignac number, because 828021 - 2³ = 828013 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

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 828021.

It is not an unprimeable number, because it can be changed into a prime (828029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138001 + ... + 138006.

It is an arithmetic number, because the mean of its divisors is an integer number (276008).

2⁸²⁸⁰²¹ is an apocalyptic number.

It is an amenable number.

828021 is a deficient number, since it is larger than the sum of its proper divisors (276011).

828021 is a wasteful number, since it uses less digits than its factorization.

828021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276010.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 828021 is about 909.9565923713. The cubic root of 828021 is about 93.9032125844.

Adding to 828021 its reverse (120828), we get a palindrome (948849).

The spelling of 828021 in words is "eight hundred twenty-eight thousand, twenty-one".