2001220111109 has 4 divisors (see below), whose sum is σ = 2001438094380. Its totient is φ = 2001002127840.

The previous prime is 2001220111061. The next prime is 2001220111117. The reversal of 2001220111109 is 9011110221002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1098140518084 + 903079593025 = 1047922^2 + 950305^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001220111109 - 2³⁶ = 1932500634373 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001220111609) 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, 108977864 + ... + 108996225.

It is an arithmetic number, because the mean of its divisors is an integer number (500359523595).

Almost surely, 2^{2001220111109} is an apocalyptic number.

It is an amenable number.

2001220111109 is a deficient number, since it is larger than the sum of its proper divisors (217983271).

2001220111109 is an equidigital number, since it uses as much as digits as its factorization.

2001220111109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217983270.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 2001220111109 in words is "two trillion, one billion, two hundred twenty million, one hundred eleven thousand, one hundred nine".