2001112221111 has 4 divisors (see below), whose sum is σ = 2668149628152. Its totient is φ = 1334074814072.

The previous prime is 2001112221029. The next prime is 2001112221113. The reversal of 2001112221111 is 1111222111002.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2001112221111 - 2⁷ = 2001112220983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001112221113) 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, 333518703516 + ... + 333518703521.

It is an arithmetic number, because the mean of its divisors is an integer number (667037407038).

Almost surely, 2^{2001112221111} is an apocalyptic number.

2001112221111 is a deficient number, since it is larger than the sum of its proper divisors (667037407041).

2001112221111 is an equidigital number, since it uses as much as digits as its factorization.

2001112221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667037407040.

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

Adding to 2001112221111 its reverse (1111222111002), we get a palindrome (3112334332113).

The spelling of 2001112221111 in words is "two trillion, one billion, one hundred twelve million, two hundred twenty-one thousand, one hundred eleven".