2001111111121 has 4 divisors (see below), whose sum is σ = 2001118980592. Its totient is φ = 2001103241652.

The previous prime is 2001111111119. The next prime is 2001111111203. The reversal of 2001111111121 is 1211111111002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2001111111121 - 2¹ = 2001111111119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001111111421) 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, 3540111 + ... + 4066276.

It is an arithmetic number, because the mean of its divisors is an integer number (500279745148).

Almost surely, 2^{2001111111121} is an apocalyptic number.

It is an amenable number.

2001111111121 is a deficient number, since it is larger than the sum of its proper divisors (7869471).

2001111111121 is an equidigital number, since it uses as much as digits as its factorization.

2001111111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7869470.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 2001111111121 its reverse (1211111111002), we get a palindrome (3212222222123).

The spelling of 2001111111121 in words is "two trillion, one billion, one hundred eleven million, one hundred eleven thousand, one hundred twenty-one".