21120566711 has 2 divisors, whose sum is σ = 21120566712. Its totient is φ = 21120566710.

The previous prime is 21120566689. The next prime is 21120566759. The reversal of 21120566711 is 11766502112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21120566711 - 2⁶ = 21120566647 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120506711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560283355 + 10560283356.

It is an arithmetic number, because the mean of its divisors is an integer number (10560283356).

Almost surely, 2^21120566711 is an apocalyptic number.

21120566711 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120566711 is an equidigital number, since it uses as much as digits as its factorization.

21120566711 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 32.

The spelling of 21120566711 in words is "twenty-one billion, one hundred twenty million, five hundred sixty-six thousand, seven hundred eleven".