6921938727 has 16 divisors (see below), whose sum is σ = 11186972160. Its totient is φ = 4195114200.

The previous prime is 6921938719. The next prime is 6921938729. The reversal of 6921938727 is 7278391296.

It is not a de Polignac number, because 6921938727 - 2³ = 6921938719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6921938729) 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 15 ways as a sum of consecutive naturals, for example, 11652799 + ... + 11653392.

It is an arithmetic number, because the mean of its divisors is an integer number (699185760).

Almost surely, 2^6921938727 is an apocalyptic number.

6921938727 is a deficient number, since it is larger than the sum of its proper divisors (4265033433).

6921938727 is a wasteful number, since it uses less digits than its factorization.

6921938727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23306211 (or 23306205 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 6921938727 is about 83198.1894454441. The cubic root of 6921938727 is about 1905.7938312255.

The spelling of 6921938727 in words is "six billion, nine hundred twenty-one million, nine hundred thirty-eight thousand, seven hundred twenty-seven".