2001211221211 has 16 divisors (see below), whose sum is σ = 2047018586400. Its totient is φ = 1955705326848.

The previous prime is 2001211221203. The next prime is 2001211221221. The reversal of 2001211221211 is 1121221121002.

It is a cyclic number.

It is not a de Polignac number, because 2001211221211 - 2³ = 2001211221203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001211221221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74251240 + ... + 74278186.

It is an arithmetic number, because the mean of its divisors is an integer number (127938661650).

Almost surely, 2^{2001211221211} is an apocalyptic number.

2001211221211 is a deficient number, since it is larger than the sum of its proper divisors (45807365189).

2001211221211 is a wasteful number, since it uses less digits than its factorization.

2001211221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32478.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2001211221211 its reverse (1121221121002), we get a palindrome (3122432342213).

The spelling of 2001211221211 in words is "two trillion, one billion, two hundred eleven million, two hundred twenty-one thousand, two hundred eleven".