21163316159989 has 2 divisors, whose sum is σ = 21163316159990. Its totient is φ = 21163316159988.

The previous prime is 21163316159971. The next prime is 21163316160037. The reversal of 21163316159989 is 98995161336112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20956554975889 + 206761184100 = 4577833^2 + 454710^2 .

It is a cyclic number.

It is not a de Polignac number, because 21163316159989 - 2⁹ = 21163316159477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21163316159989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21163316153989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10581658079994 + 10581658079995.

It is an arithmetic number, because the mean of its divisors is an integer number (10581658079995).

Almost surely, 2^{21163316159989} is an apocalyptic number.

It is an amenable number.

21163316159989 is a deficient number, since it is larger than the sum of its proper divisors (1).

21163316159989 is an equidigital number, since it uses as much as digits as its factorization.

21163316159989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18895680, while the sum is 64.

The spelling of 21163316159989 in words is "twenty-one trillion, one hundred sixty-three billion, three hundred sixteen million, one hundred fifty-nine thousand, nine hundred eighty-nine".