21688582809599 has 2 divisors, whose sum is σ = 21688582809600. Its totient is φ = 21688582809598.

The previous prime is 21688582809541. The next prime is 21688582809613. The reversal of 21688582809599 is 99590828588612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21688582809599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21688542809599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10844291404799 + 10844291404800.

It is an arithmetic number, because the mean of its divisors is an integer number (10844291404800).

Almost surely, 2^{21688582809599} is an apocalyptic number.

21688582809599 is a deficient number, since it is larger than the sum of its proper divisors (1).

21688582809599 is an equidigital number, since it uses as much as digits as its factorization.

21688582809599 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1791590400, while the sum is 80.

The spelling of 21688582809599 in words is "twenty-one trillion, six hundred eighty-eight billion, five hundred eighty-two million, eight hundred nine thousand, five hundred ninety-nine".