2001121111211 has 2 divisors, whose sum is σ = 2001121111212. Its totient is φ = 2001121111210.

The previous prime is 2001121111189. The next prime is 2001121111237. The reversal of 2001121111211 is 1121111211002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2001121111211 - 2⁶ = 2001121111147 is a prime.

It is not a weakly prime, because it can be changed into another prime (2001121111811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000560555605 + 1000560555606.

It is an arithmetic number, because the mean of its divisors is an integer number (1000560555606).

Almost surely, 2^{2001121111211} is an apocalyptic number.

2001121111211 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001121111211 is an equidigital number, since it uses as much as digits as its factorization.

2001121111211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 2001121111211 its reverse (1121111211002), we get a palindrome (3122232322213).

The spelling of 2001121111211 in words is "two trillion, one billion, one hundred twenty-one million, one hundred eleven thousand, two hundred eleven".