2001123312011 has 4 divisors (see below), whose sum is σ = 2008562432400. Its totient is φ = 1993684191624.

The previous prime is 2001123312007. The next prime is 2001123312029. The reversal of 2001123312011 is 1102133211002.

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 2001123312011 - 2² = 2001123312007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001123315011) 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, 3719559791 + ... + 3719560328.

It is an arithmetic number, because the mean of its divisors is an integer number (502140608100).

Almost surely, 2^{2001123312011} is an apocalyptic number.

2001123312011 is a deficient number, since it is larger than the sum of its proper divisors (7439120389).

2001123312011 is an equidigital number, since it uses as much as digits as its factorization.

2001123312011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7439120388.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 2001123312011 its reverse (1102133211002), we get a palindrome (3103256523013).

The spelling of 2001123312011 in words is "two trillion, one billion, one hundred twenty-three million, three hundred twelve thousand, eleven".