2001221121211 has 8 divisors (see below), whose sum is σ = 2281935396384. Its totient is φ = 1738617444480.

The previous prime is 2001221121203. The next prime is 2001221121217. The reversal of 2001221121211 is 1121211221002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2001221121211 - 2³ = 2001221121203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001221121217) 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 in 7 ways as a sum of consecutive naturals, for example, 4527649375 + ... + 4527649816.

It is an arithmetic number, because the mean of its divisors is an integer number (285241924548).

Almost surely, 2^{2001221121211} is an apocalyptic number.

2001221121211 is a deficient number, since it is larger than the sum of its proper divisors (280714275173).

2001221121211 is a wasteful number, since it uses less digits than its factorization.

2001221121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9055299221.

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

Adding to 2001221121211 its reverse (1121211221002), we get a palindrome (3122432342213).

The spelling of 2001221121211 in words is "two trillion, one billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred eleven".