821022 has 16 divisors (see below), whose sum is σ = 1652880. Its totient is φ = 271872.

The previous prime is 821003. The next prime is 821027. The reversal of 821022 is 220128.

821022 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 820992 and 821010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821027) by changing a digit.

821022 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 804 + ... + 1512.

It is an arithmetic number, because the mean of its divisors is an integer number (103305).

2⁸²¹⁰²² is an apocalyptic number.

821022 is an abundant number, since it is smaller than the sum of its proper divisors (831858).

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

821022 is a wasteful number, since it uses less digits than its factorization.

821022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 821022 is about 906.1026431923. The cubic root of 821022 is about 93.6378855327.

The spelling of 821022 in words is "eight hundred twenty-one thousand, twenty-two".