6921255592871 has 2 divisors, whose sum is σ = 6921255592872. Its totient is φ = 6921255592870.

The previous prime is 6921255592799. The next prime is 6921255592877. The reversal of 6921255592871 is 1782955521296.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6921255592871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6921255592877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3460627796435 + 3460627796436.

It is an arithmetic number, because the mean of its divisors is an integer number (3460627796436).

Almost surely, 2^{6921255592871} is an apocalyptic number.

6921255592871 is a deficient number, since it is larger than the sum of its proper divisors (1).

6921255592871 is an equidigital number, since it uses as much as digits as its factorization.

6921255592871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216000, while the sum is 62.

The spelling of 6921255592871 in words is "six trillion, nine hundred twenty-one billion, two hundred fifty-five million, five hundred ninety-two thousand, eight hundred seventy-one".