21616175117 has 2 divisors, whose sum is σ = 21616175118. Its totient is φ = 21616175116.

The previous prime is 21616175083. The next prime is 21616175143. The reversal of 21616175117 is 71157161612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13868830756 + 7747344361 = 117766^2 + 88019^2 .

It is a cyclic number.

It is not a de Polignac number, because 21616175117 - 2¹⁰ = 21616174093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21616175717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10808087558 + 10808087559.

It is an arithmetic number, because the mean of its divisors is an integer number (10808087559).

Almost surely, 2^21616175117 is an apocalyptic number.

It is an amenable number.

21616175117 is a deficient number, since it is larger than the sum of its proper divisors (1).

21616175117 is an equidigital number, since it uses as much as digits as its factorization.

21616175117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17640, while the sum is 38.

The spelling of 21616175117 in words is "twenty-one billion, six hundred sixteen million, one hundred seventy-five thousand, one hundred seventeen".