2001111222111 has 16 divisors (see below), whose sum is σ = 2868334118400. Its totient is φ = 1236969085248.

The previous prime is 2001111222053. The next prime is 2001111222119. The reversal of 2001111222111 is 1112221111002.

It is a happy number.

It is not a de Polignac number, because 2001111222111 - 2²² = 2001107027807 is a prime.

It is a super-2 number, since 2×2001111222111² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001111222119) 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 15 ways as a sum of consecutive naturals, for example, 373478326 + ... + 373483683.

It is an arithmetic number, because the mean of its divisors is an integer number (179270882400).

Almost surely, 2^{2001111222111} is an apocalyptic number.

2001111222111 is a deficient number, since it is larger than the sum of its proper divisors (867222896289).

2001111222111 is a wasteful number, since it uses less digits than its factorization.

2001111222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746962078.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 2001111222111 its reverse (1112221111002), we get a palindrome (3113332333113).

It can be divided in two parts, 2001111 and 222111, that added together give a palindrome (2223222).

The spelling of 2001111222111 in words is "two trillion, one billion, one hundred eleven million, two hundred twenty-two thousand, one hundred eleven".