6821943248440 has 96 divisors (see below), whose sum is σ = 16867644184800. Its totient is φ = 2479700142080.

The previous prime is 6821943248437. The next prime is 6821943248443. The reversal of 6821943248440 is 448423491286.

It is an interprime number because it is at equal distance from previous prime (6821943248437) and next prime (6821943248443).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6821943248443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9839476 + ... + 10509955.

It is an arithmetic number, because the mean of its divisors is an integer number (175704626925).

Almost surely, 2^{6821943248440} is an apocalyptic number.

It is an amenable number.

6821943248440 is an abundant number, since it is smaller than the sum of its proper divisors (10045700936360).

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

6821943248440 is a wasteful number, since it uses less digits than its factorization.

6821943248440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20349505 (or 20349484 counting only the distinct ones).

The product of its (nonzero) digits is 10616832, while the sum is 55.

The spelling of 6821943248440 in words is "six trillion, eight hundred twenty-one billion, nine hundred forty-three million, two hundred forty-eight thousand, four hundred forty".