821972882 has 16 divisors (see below), whose sum is σ = 1306056312. Its totient is φ = 386641920.

The previous prime is 821972869. The next prime is 821972887. The reversal of 821972882 is 288279128.

It can be written as a sum of positive squares in 4 ways, for example, as 708145321 + 113827561 = 26611^2 + 10669^2 .

It is not an unprimeable number, because it can be changed into a prime (821972887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110678 + ... + 117870.

Almost surely, 2^821972882 is an apocalyptic number.

821972882 is a deficient number, since it is larger than the sum of its proper divisors (484083430).

821972882 is a wasteful number, since it uses less digits than its factorization.

821972882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10573.

The product of its digits is 258048, while the sum is 47.

The square root of 821972882 is about 28670.0694453292. The cubic root of 821972882 is about 936.7402107599.

The spelling of 821972882 in words is "eight hundred twenty-one million, nine hundred seventy-two thousand, eight hundred eighty-two".