6921906911 has 2 divisors, whose sum is σ = 6921906912. Its totient is φ = 6921906910.

The previous prime is 6921906857. The next prime is 6921906913. The reversal of 6921906911 is 1196091296.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6921906911 - 2²⁶ = 6854798047 is a prime.

Together with 6921906913, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6921906913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3460953455 + 3460953456.

It is an arithmetic number, because the mean of its divisors is an integer number (3460953456).

Almost surely, 2^6921906911 is an apocalyptic number.

6921906911 is a deficient number, since it is larger than the sum of its proper divisors (1).

6921906911 is an equidigital number, since it uses as much as digits as its factorization.

6921906911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 44.

The square root of 6921906911 is about 83197.9982391403. The cubic root of 6921906911 is about 1905.7909112907.

The spelling of 6921906911 in words is "six billion, nine hundred twenty-one million, nine hundred six thousand, nine hundred eleven".