821139016 has 16 divisors (see below), whose sum is σ = 1540089900. Its totient is φ = 410448384.

The previous prime is 821138999. The next prime is 821139019. The reversal of 821139016 is 610931128.

It can be written as a sum of positive squares in 2 ways, for example, as 815330916 + 5808100 = 28554^2 + 2410^2 .

It is not an unprimeable number, because it can be changed into a prime (821139019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17916 + ... + 44308.

Almost surely, 2^821139016 is an apocalyptic number.

It is an amenable number.

821139016 is a deficient number, since it is larger than the sum of its proper divisors (718950884).

821139016 is a wasteful number, since it uses less digits than its factorization.

821139016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30288 (or 30284 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 821139016 is about 28655.5233070345. The cubic root of 821139016 is about 936.4233389514.

The spelling of 821139016 in words is "eight hundred twenty-one million, one hundred thirty-nine thousand, sixteen".