26921784871 has 2 divisors, whose sum is σ = 26921784872. Its totient is φ = 26921784870.

The previous prime is 26921784839. The next prime is 26921784881. The reversal of 26921784871 is 17848712962.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26921784871 - 2⁵ = 26921784839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26921784821) 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 as a sum of consecutive naturals, namely, 13460892435 + 13460892436.

It is an arithmetic number, because the mean of its divisors is an integer number (13460892436).

Almost surely, 2^26921784871 is an apocalyptic number.

26921784871 is a deficient number, since it is larger than the sum of its proper divisors (1).

26921784871 is an equidigital number, since it uses as much as digits as its factorization.

26921784871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2709504, while the sum is 55.

The spelling of 26921784871 in words is "twenty-six billion, nine hundred twenty-one million, seven hundred eighty-four thousand, eight hundred seventy-one".