21166016310287 has 2 divisors, whose sum is σ = 21166016310288. Its totient is φ = 21166016310286.

The previous prime is 21166016310251. The next prime is 21166016310289. The reversal of 21166016310287 is 78201361066112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21166016310287 is a prime.

Together with 21166016310289, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21166016310289) 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, 10583008155143 + 10583008155144.

It is an arithmetic number, because the mean of its divisors is an integer number (10583008155144).

Almost surely, 2^{21166016310287} is an apocalyptic number.

21166016310287 is a deficient number, since it is larger than the sum of its proper divisors (1).

21166016310287 is an equidigital number, since it uses as much as digits as its factorization.

21166016310287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 44.

Adding to 21166016310287 its reverse (78201361066112), we get a palindrome (99367377376399).

The spelling of 21166016310287 in words is "twenty-one trillion, one hundred sixty-six billion, sixteen million, three hundred ten thousand, two hundred eighty-seven".