2001220101191 has 16 divisors (see below), whose sum is σ = 2093255654400. Its totient is φ = 1909604928000.

The previous prime is 2001220101151. The next prime is 2001220101217. The reversal of 2001220101191 is 1911010221002.

It is a cyclic number.

It is not a de Polignac number, because 2001220101191 - 2²² = 2001215906887 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 (2001220101121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72099566 + ... + 72127316.

It is an arithmetic number, because the mean of its divisors is an integer number (130828478400).

Almost surely, 2^{2001220101191} is an apocalyptic number.

2001220101191 is a deficient number, since it is larger than the sum of its proper divisors (92035553209).

2001220101191 is a wasteful number, since it uses less digits than its factorization.

2001220101191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35206.

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

Adding to 2001220101191 its reverse (1911010221002), we get a palindrome (3912230322193).

The spelling of 2001220101191 in words is "two trillion, one billion, two hundred twenty million, one hundred one thousand, one hundred ninety-one".