6821385135 has 16 divisors (see below), whose sum is σ = 11014349280. Its totient is φ = 3604694400.

The previous prime is 6821385101. The next prime is 6821385139. The reversal of 6821385135 is 5315831286.

It is not a de Polignac number, because 6821385135 - 2⁶ = 6821385071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6821385139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2084416 + ... + 2087685.

It is an arithmetic number, because the mean of its divisors is an integer number (688396830).

Almost surely, 2^6821385135 is an apocalyptic number.

6821385135 is a deficient number, since it is larger than the sum of its proper divisors (4192964145).

6821385135 is a wasteful number, since it uses less digits than its factorization.

6821385135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4172218.

The product of its digits is 172800, while the sum is 42.

The square root of 6821385135 is about 82591.6771533306. The cubic root of 6821385135 is about 1896.5204214745.

The spelling of 6821385135 in words is "six billion, eight hundred twenty-one million, three hundred eighty-five thousand, one hundred thirty-five".