6821909359898 has 12 divisors (see below), whose sum is σ = 10261934817918. Its totient is φ = 3401291794560.

The previous prime is 6821909359861. The next prime is 6821909359901. The reversal of 6821909359898 is 8989539091286.

It can be written as a sum of positive squares in 3 ways, for example, as 6350485680289 + 471423679609 = 2520017^2 + 686603^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13437413 + ... + 13935848.

Almost surely, 2^{6821909359898} is an apocalyptic number.

6821909359898 is a deficient number, since it is larger than the sum of its proper divisors (3440025458020).

6821909359898 is an equidigital number, since it uses as much as digits as its factorization.

6821909359898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27373969 (or 27373616 counting only the distinct ones).

The product of its (nonzero) digits is 604661760, while the sum is 77.

The spelling of 6821909359898 in words is "six trillion, eight hundred twenty-one billion, nine hundred nine million, three hundred fifty-nine thousand, eight hundred ninety-eight".