6821405813928 has 32 divisors (see below), whose sum is σ = 17258978570400. Its totient is φ = 2246406733248.

The previous prime is 6821405813921. The next prime is 6821405813933. The reversal of 6821405813928 is 8293185041286.

It is not an unprimeable number, because it can be changed into a prime (6821405813921) 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, 1712198263 + ... + 1712202246.

It is an arithmetic number, because the mean of its divisors is an integer number (539343080325).

Almost surely, 2^{6821405813928} is an apocalyptic number.

It is an amenable number.

6821405813928 is an abundant number, since it is smaller than the sum of its proper divisors (10437572756472).

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

6821405813928 is a wasteful number, since it uses less digits than its factorization.

6821405813928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3424400601 (or 3424400597 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 57.

The spelling of 6821405813928 in words is "six trillion, eight hundred twenty-one billion, four hundred five million, eight hundred thirteen thousand, nine hundred twenty-eight".