21101200099999 has 2 divisors, whose sum is σ = 21101200100000. Its totient is φ = 21101200099998.

The previous prime is 21101200099997. The next prime is 21101200100027. The reversal of 21101200099999 is 99999000210112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21101200099999 - 2¹ = 21101200099997 is a prime.

Together with 21101200099997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101200099997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550600049999 + 10550600050000.

It is an arithmetic number, because the mean of its divisors is an integer number (10550600050000).

Almost surely, 2^{21101200099999} is an apocalyptic number.

21101200099999 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101200099999 is an equidigital number, since it uses as much as digits as its factorization.

21101200099999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 236196, while the sum is 52.

The spelling of 21101200099999 in words is "twenty-one trillion, one hundred one billion, two hundred million, ninety-nine thousand, nine hundred ninety-nine".