2001221101211 has 2 divisors, whose sum is σ = 2001221101212. Its totient is φ = 2001221101210.

The previous prime is 2001221101207. The next prime is 2001221101213. The reversal of 2001221101211 is 1121011221002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2001221101211 - 2² = 2001221101207 is a prime.

Together with 2001221101213, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2001221101213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000610550605 + 1000610550606.

It is an arithmetic number, because the mean of its divisors is an integer number (1000610550606).

Almost surely, 2^{2001221101211} is an apocalyptic number.

2001221101211 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001221101211 is an equidigital number, since it uses as much as digits as its factorization.

2001221101211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2001221101211 its reverse (1121011221002), we get a palindrome (3122232322213).

The spelling of 2001221101211 in words is "two trillion, one billion, two hundred twenty-one million, one hundred one thousand, two hundred eleven".