2001220112011 has 4 divisors (see below), whose sum is σ = 2008444733632. Its totient is φ = 1993995490392.

The previous prime is 2001220111999. The next prime is 2001220112041. The reversal of 2001220112011 is 1102110221002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001220112011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001220111982 and 2001220112000.

It is not an unprimeable number, because it can be changed into a prime (2001220112041) 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, 3612310395 + ... + 3612310948.

It is an arithmetic number, because the mean of its divisors is an integer number (502111183408).

Almost surely, 2^{2001220112011} is an apocalyptic number.

2001220112011 is a deficient number, since it is larger than the sum of its proper divisors (7224621621).

2001220112011 is an equidigital number, since it uses as much as digits as its factorization.

2001220112011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7224621620.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2001220112011 its reverse (1102110221002), we get a palindrome (3103330333013).

The spelling of 2001220112011 in words is "two trillion, one billion, two hundred twenty million, one hundred twelve thousand, eleven".