21200100000999 has 4 divisors (see below), whose sum is σ = 28266800001336. Its totient is φ = 14133400000664.

The previous prime is 21200100000991. The next prime is 21200100001027. The reversal of 21200100000999 is 99900000100212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21200100000999 - 2³ = 21200100000991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200100000991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3533350000164 + ... + 3533350000169.

It is an arithmetic number, because the mean of its divisors is an integer number (7066700000334).

Almost surely, 2^{21200100000999} is an apocalyptic number.

21200100000999 is a deficient number, since it is larger than the sum of its proper divisors (7066700000337).

21200100000999 is an equidigital number, since it uses as much as digits as its factorization.

21200100000999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7066700000336.

The product of its (nonzero) digits is 2916, while the sum is 33.

The spelling of 21200100000999 in words is "twenty-one trillion, two hundred billion, one hundred million, nine hundred ninety-nine", and thus it is an aban number.