822921 has 12 divisors (see below), whose sum is σ = 1206576. Its totient is φ = 498520.

The previous prime is 822907. The next prime is 822949. The reversal of 822921 is 129228.

It is not a de Polignac number, because 822921 - 2⁵ = 822889 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 822891 and 822900.

It is not an unprimeable number, because it can be changed into a prime (822901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 771 + ... + 1496.

It is an arithmetic number, because the mean of its divisors is an integer number (100548).

2⁸²²⁹²¹ is an apocalyptic number.

It is an amenable number.

822921 is a deficient number, since it is larger than the sum of its proper divisors (383655).

822921 is a wasteful number, since it uses less digits than its factorization.

822921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2292 (or 2281 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

The square root of 822921 is about 907.1499324808. The cubic root of 822921 is about 93.7100238450.

It can be divided in two parts, 82 and 2921, that added together give a palindrome (3003).

The spelling of 822921 in words is "eight hundred twenty-two thousand, nine hundred twenty-one".