21101000099999 has 2 divisors, whose sum is σ = 21101000100000. Its totient is φ = 21101000099998.

The previous prime is 21101000099917. The next prime is 21101000100001. The reversal of 21101000099999 is 99999000010112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21101000099999 - 2⁸ = 21101000099743 is a prime.

Together with 21101000100001, 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 (21101000099299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550500049999 + 10550500050000.

It is an arithmetic number, because the mean of its divisors is an integer number (10550500050000).

Almost surely, 2^{21101000099999} is an apocalyptic number.

21101000099999 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101000099999 is an equidigital number, since it uses as much as digits as its factorization.

21101000099999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 118098, while the sum is 50.

The spelling of 21101000099999 in words is "twenty-one trillion, one hundred one billion, ninety-nine thousand, nine hundred ninety-nine".