21180663089 has 2 divisors, whose sum is σ = 21180663090. Its totient is φ = 21180663088.

The previous prime is 21180663083. The next prime is 21180663121. The reversal of 21180663089 is 98036608112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14051731600 + 7128931489 = 118540^2 + 84433^2 .

It is a cyclic number.

It is not a de Polignac number, because 21180663089 - 2³² = 16885695793 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21180663083) 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, 10590331544 + 10590331545.

It is an arithmetic number, because the mean of its divisors is an integer number (10590331545).

Almost surely, 2^21180663089 is an apocalyptic number.

It is an amenable number.

21180663089 is a deficient number, since it is larger than the sum of its proper divisors (1).

21180663089 is an equidigital number, since it uses as much as digits as its factorization.

21180663089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 44.

The spelling of 21180663089 in words is "twenty-one billion, one hundred eighty million, six hundred sixty-three thousand, eighty-nine".