2001212120109 has 16 divisors (see below), whose sum is σ = 2740471793792. Its totient is φ = 1298048856768.

The previous prime is 2001212120059. The next prime is 2001212120179. The reversal of 2001212120109 is 9010212121002.

It is not a de Polignac number, because 2001212120109 - 2¹⁷ = 2001211989037 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 (2001212120179) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4319847 + ... + 4760619.

It is an arithmetic number, because the mean of its divisors is an integer number (171279487112).

Almost surely, 2^{2001212120109} is an apocalyptic number.

It is an amenable number.

2001212120109 is a deficient number, since it is larger than the sum of its proper divisors (739259673683).

2001212120109 is a wasteful number, since it uses less digits than its factorization.

2001212120109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481716.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 2001212120109 in words is "two trillion, one billion, two hundred twelve million, one hundred twenty thousand, one hundred nine".