821018 has 16 divisors (see below), whose sum is σ = 1365984. Its totient is φ = 366960.

The previous prime is 821003. The next prime is 821027. The reversal of 821018 is 810128.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 821018.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1196 + ... + 1752.

It is an arithmetic number, because the mean of its divisors is an integer number (85374).

2⁸²¹⁰¹⁸ is an apocalyptic number.

821018 is a deficient number, since it is larger than the sum of its proper divisors (544966).

821018 is a wasteful number, since it uses less digits than its factorization.

821018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 821018 is about 906.1004359341. The cubic root of 821018 is about 93.6377334653.

It can be divided in two parts, 8210 and 18, that added together give a palindrome (8228).

The spelling of 821018 in words is "eight hundred twenty-one thousand, eighteen".