21516441788159 has 2 divisors, whose sum is σ = 21516441788160. Its totient is φ = 21516441788158.

The previous prime is 21516441788143. The next prime is 21516441788161. The reversal of 21516441788159 is 95188714461512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21516441788159 - 2⁴ = 21516441788143 is a prime.

Together with 21516441788161, 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 (21516441788059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10758220894079 + 10758220894080.

It is an arithmetic number, because the mean of its divisors is an integer number (10758220894080).

Almost surely, 2^{21516441788159} is an apocalyptic number.

21516441788159 is a deficient number, since it is larger than the sum of its proper divisors (1).

21516441788159 is an equidigital number, since it uses as much as digits as its factorization.

21516441788159 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19353600, while the sum is 62.

The spelling of 21516441788159 in words is "twenty-one trillion, five hundred sixteen billion, four hundred forty-one million, seven hundred eighty-eight thousand, one hundred fifty-nine".