821030 has 32 divisors (see below), whose sum is σ = 1740096. Its totient is φ = 273024.

The previous prime is 821027. The next prime is 821039. The reversal of 821030 is 30128.

821030 is nontrivially palindromic in base 13.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a zygodrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 820996 and 821014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2432 + ... + 2748.

It is an arithmetic number, because the mean of its divisors is an integer number (54378).

2⁸²¹⁰³⁰ is an apocalyptic number.

821030 is the 740-th pentagonal number.

821030 is an abundant number, since it is smaller than the sum of its proper divisors (919066).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821030 is a wasteful number, since it uses less digits than its factorization.

821030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 821030 is about 906.1070576924. The cubic root of 821030 is about 93.6381896661.

Adding to 821030 its reverse (30128), we get a palindrome (851158).

The spelling of 821030 in words is "eight hundred twenty-one thousand, thirty".