21100201000999 has 2 divisors, whose sum is σ = 21100201001000. Its totient is φ = 21100201000998.

The previous prime is 21100201000997. The next prime is 21100201001039. The reversal of 21100201000999 is 99900010200112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21100201000999 - 2¹ = 21100201000997 is a prime.

Together with 21100201000997, 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 (21100201000993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550100500499 + 10550100500500.

It is an arithmetic number, because the mean of its divisors is an integer number (10550100500500).

Almost surely, 2^{21100201000999} is an apocalyptic number.

21100201000999 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100201000999 is an equidigital number, since it uses as much as digits as its factorization.

21100201000999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 34.

The spelling of 21100201000999 in words is "twenty-one trillion, one hundred billion, two hundred one million, nine hundred ninety-nine", and thus it is an aban number.