821118396 has 24 divisors (see below), whose sum is σ = 2189649280. Its totient is φ = 234605232.

The previous prime is 821118391. The next prime is 821118409. The reversal of 821118396 is 693811128.

821118396 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×821118396² = 1348470840499225632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821118391) 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, 4887526 + ... + 4887693.

Almost surely, 2^821118396 is an apocalyptic number.

It is an amenable number.

821118396 is an abundant number, since it is smaller than the sum of its proper divisors (1368530884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821118396 is a wasteful number, since it uses less digits than its factorization.

821118396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9775233 (or 9775231 counting only the distinct ones).

The product of its digits is 20736, while the sum is 39.

The square root of 821118396 is about 28655.1635137544. The cubic root of 821118396 is about 936.4155005666.

The spelling of 821118396 in words is "eight hundred twenty-one million, one hundred eighteen thousand, three hundred ninety-six".