2001211001999 has 24 divisors (see below), whose sum is σ = 2316162990960. Its totient is φ = 1713705862400.

The previous prime is 2001211001963. The next prime is 2001211002031. The reversal of 2001211001999 is 9991001121002.

It is a de Polignac number, because none of the positive numbers 2^k-2001211001999 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 (2001211001939) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2258804 + ... + 3017385.

It is an arithmetic number, because the mean of its divisors is an integer number (96506791290).

Almost surely, 2^{2001211001999} is an apocalyptic number.

2001211001999 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

2001211001999 is a deficient number, since it is larger than the sum of its proper divisors (314951988961).

2001211001999 is a wasteful number, since it uses less digits than its factorization.

2001211001999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5276299 (or 5276270 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 35.

It can be divided in two parts, 20012 and 11001999, that added together give a palindrome (11022011).

The spelling of 2001211001999 in words is "two trillion, one billion, two hundred eleven million, one thousand, nine hundred ninety-nine".