2001100001999 has 20 divisors (see below), whose sum is σ = 2435976861936. Its totient is φ = 1640653372512.

The previous prime is 2001100001987. The next prime is 2001100002047. The reversal of 2001100001999 is 9991000011002.

It is not a de Polignac number, because 2001100001999 - 2¹⁶ = 2001099936463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001100001399) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18063134 + ... + 18173579.

Almost surely, 2^{2001100001999} is an apocalyptic number.

2001100001999 is a deficient number, since it is larger than the sum of its proper divisors (434876859937).

2001100001999 is an frugal number, since it uses more digits than its factorization.

2001100001999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36236764 (or 36236743 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 32.

The spelling of 2001100001999 in words is "two trillion, one billion, one hundred million, one thousand, nine hundred ninety-nine".