822021281 has 4 divisors (see below), whose sum is σ = 870375492. Its totient is φ = 773667072.

The previous prime is 822021251. The next prime is 822021283. The reversal of 822021281 is 182120228.

822021281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 620807056 + 201214225 = 24916^2 + 14185^2 .

It is a cyclic number.

It is not a de Polignac number, because 822021281 - 2¹⁰ = 822020257 is a prime.

It is a super-2 number, since 2×822021281² = 1351437972833761922, which contains 22 as substring.

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 822021281.

It is not an unprimeable number, because it can be changed into a prime (822021283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24177080 + ... + 24177113.

It is an arithmetic number, because the mean of its divisors is an integer number (217593873).

Almost surely, 2^822021281 is an apocalyptic number.

It is an amenable number.

822021281 is a deficient number, since it is larger than the sum of its proper divisors (48354211).

822021281 is a wasteful number, since it uses less digits than its factorization.

822021281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48354210.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 822021281 is about 28670.9135013170. The cubic root of 822021281 is about 936.7585959567.

The spelling of 822021281 in words is "eight hundred twenty-two million, twenty-one thousand, two hundred eighty-one".