821982606400 has 84 divisors (see below), whose sum is σ = 2033891050320. Its totient is φ = 326956096000.

The previous prime is 821982606377. The next prime is 821982606413. The reversal of 821982606400 is 4606289128.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1148626 + ... + 1721425.

Almost surely, 2^821982606400 is an apocalyptic number.

821982606400 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

821982606400 is an abundant number, since it is smaller than the sum of its proper divisors (1211908443920).

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

821982606400 is a wasteful number, since it uses less digits than its factorization.

821982606400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2870252 (or 2870237 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 46.

The spelling of 821982606400 in words is "eight hundred twenty-one billion, nine hundred eighty-two million, six hundred six thousand, four hundred".