820821535468 has 24 divisors (see below), whose sum is σ = 1567069620480. Its totient is φ = 373089581520.

The previous prime is 820821535447. The next prime is 820821535477. The reversal of 820821535468 is 864535128028.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1318705 + ... + 1838647.

It is an arithmetic number, because the mean of its divisors is an integer number (65294567520).

Almost surely, 2^820821535468 is an apocalyptic number.

It is an amenable number.

820821535468 is a deficient number, since it is larger than the sum of its proper divisors (746248085012).

820821535468 is a wasteful number, since it uses less digits than its factorization.

820821535468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555837 (or 555835 counting only the distinct ones).

The product of its (nonzero) digits is 3686400, while the sum is 52.

The spelling of 820821535468 in words is "eight hundred twenty billion, eight hundred twenty-one million, five hundred thirty-five thousand, four hundred sixty-eight".