2001220221211 has 2 divisors, whose sum is σ = 2001220221212. Its totient is φ = 2001220221210.

The previous prime is 2001220221191. The next prime is 2001220221263. The reversal of 2001220221211 is 1121220221002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001220221211 is a prime.

It is not a weakly prime, because it can be changed into another prime (2001220251211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000610110605 + 1000610110606.

It is an arithmetic number, because the mean of its divisors is an integer number (1000610110606).

Almost surely, 2^{2001220221211} is an apocalyptic number.

2001220221211 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001220221211 is an equidigital number, since it uses as much as digits as its factorization.

2001220221211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2001220221211 its reverse (1121220221002), we get a palindrome (3122440442213).

The spelling of 2001220221211 in words is "two trillion, one billion, two hundred twenty million, two hundred twenty-one thousand, two hundred eleven".