2001311242111 has 4 divisors (see below), whose sum is σ = 2001355449912. Its totient is φ = 2001267034312.

The previous prime is 2001311242039. The next prime is 2001311242127. The reversal of 2001311242111 is 1112421131002.

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 2001311242111 - 2⁷ = 2001311241983 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 (2001311243111) 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, 22035925 + ... + 22126558.

It is an arithmetic number, because the mean of its divisors is an integer number (500338862478).

Almost surely, 2^{2001311242111} is an apocalyptic number.

2001311242111 is a deficient number, since it is larger than the sum of its proper divisors (44207801).

2001311242111 is an equidigital number, since it uses as much as digits as its factorization.

2001311242111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44207800.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 2001311242111 its reverse (1112421131002), we get a palindrome (3113732373113).

It can be divided in two parts, 2001311 and 242111, that added together give a palindrome (2243422).

The spelling of 2001311242111 in words is "two trillion, one billion, three hundred eleven million, two hundred forty-two thousand, one hundred eleven".