822221821 has 8 divisors (see below), whose sum is σ = 834019200. Its totient is φ = 810469632.

The previous prime is 822221801. The next prime is 822221837. The reversal of 822221821 is 128122228.

822221821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 822221821 - 2⁷ = 822221693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 822221821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (822221801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26236 + ... + 48298.

It is an arithmetic number, because the mean of its divisors is an integer number (104252400).

Almost surely, 2^822221821 is an apocalyptic number.

It is an amenable number.

822221821 is a deficient number, since it is larger than the sum of its proper divisors (11797379).

822221821 is a wasteful number, since it uses less digits than its factorization.

822221821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22595.

The product of its digits is 2048, while the sum is 28.

The square root of 822221821 is about 28674.4105606375. The cubic root of 822221821 is about 936.8347668534.

The spelling of 822221821 in words is "eight hundred twenty-two million, two hundred twenty-one thousand, eight hundred twenty-one".