21010066559 has 2 divisors, whose sum is σ = 21010066560. Its totient is φ = 21010066558.

The previous prime is 21010066549. The next prime is 21010066579. The reversal of 21010066559 is 95566001012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21010066559 - 2⁸ = 21010066303 is a prime.

It is a super-2 number, since 2×21010066559² (a number of 21 digits) contains 22 as substring.

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 (21010066549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505033279 + 10505033280.

It is an arithmetic number, because the mean of its divisors is an integer number (10505033280).

Almost surely, 2^21010066559 is an apocalyptic number.

21010066559 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010066559 is an equidigital number, since it uses as much as digits as its factorization.

21010066559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 35.

The spelling of 21010066559 in words is "twenty-one billion, ten million, sixty-six thousand, five hundred fifty-nine".