6821407547540 has 24 divisors (see below), whose sum is σ = 14434306663392. Its totient is φ = 2707734292640.

The previous prime is 6821407547533. The next prime is 6821407547557. The reversal of 6821407547540 is 457457041286.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1301792714 + ... + 1301797953.

It is an arithmetic number, because the mean of its divisors is an integer number (601429444308).

Almost surely, 2^{6821407547540} is an apocalyptic number.

It is an amenable number.

6821407547540 is an abundant number, since it is smaller than the sum of its proper divisors (7612899115852).

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

6821407547540 is a wasteful number, since it uses less digits than its factorization.

6821407547540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2603590807 (or 2603590805 counting only the distinct ones).

The product of its (nonzero) digits is 7526400, while the sum is 53.

The spelling of 6821407547540 in words is "six trillion, eight hundred twenty-one billion, four hundred seven million, five hundred forty-seven thousand, five hundred forty".