2001022111205 has 64 divisors (see below), whose sum is σ = 2684137623552. Its totient is φ = 1422632090880.

The previous prime is 2001022111201. The next prime is 2001022111217. The reversal of 2001022111205 is 5021112201002.

It is not a de Polignac number, because 2001022111205 - 2² = 2001022111201 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 (2001022111201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 102759620 + ... + 102779090.

It is an arithmetic number, because the mean of its divisors is an integer number (41939650368).

Almost surely, 2^{2001022111205} is an apocalyptic number.

It is an amenable number.

2001022111205 is a deficient number, since it is larger than the sum of its proper divisors (683115512347).

2001022111205 is a wasteful number, since it uses less digits than its factorization.

2001022111205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20058.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 2001022111205 its reverse (5021112201002), we get a palindrome (7022134312207).

The spelling of 2001022111205 in words is "two trillion, one billion, twenty-two million, one hundred eleven thousand, two hundred five".