821204 has 12 divisors (see below), whose sum is σ = 1444800. Its totient is φ = 408408.

The previous prime is 821173. The next prime is 821207. The reversal of 821204 is 402128.

821204 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821207) 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, 527 + ... + 1385.

It is an arithmetic number, because the mean of its divisors is an integer number (120400).

2⁸²¹²⁰⁴ is an apocalyptic number.

It is an amenable number.

821204 is a deficient number, since it is larger than the sum of its proper divisors (623596).

821204 is a wasteful number, since it uses less digits than its factorization.

821204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102 (or 1100 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 821204 is about 906.2030677503. The cubic root of 821204 is about 93.6448040790.

It can be divided in two parts, 8 and 21204, that added together give a palindrome (21212).

The spelling of 821204 in words is "eight hundred twenty-one thousand, two hundred four".