21696350099 has 2 divisors, whose sum is σ = 21696350100. Its totient is φ = 21696350098.

The previous prime is 21696350057. The next prime is 21696350101. The reversal of 21696350099 is 99005369612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21696350099 - 2²⁴ = 21679572883 is a prime.

Together with 21696350101, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21696350699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10848175049 + 10848175050.

It is an arithmetic number, because the mean of its divisors is an integer number (10848175050).

Almost surely, 2^21696350099 is an apocalyptic number.

21696350099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21696350099 is an equidigital number, since it uses as much as digits as its factorization.

21696350099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 787320, while the sum is 50.

The spelling of 21696350099 in words is "twenty-one billion, six hundred ninety-six million, three hundred fifty thousand, ninety-nine".