2001221021211 has 8 divisors (see below), whose sum is σ = 2808731257920. Its totient is φ = 1263929065992.

The previous prime is 2001221021179. The next prime is 2001221021213. The reversal of 2001221021211 is 1121201221002.

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

It is not a de Polignac number, because 2001221021211 - 2⁵ = 2001221021179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2001221021213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17554570305 + ... + 17554570418.

It is an arithmetic number, because the mean of its divisors is an integer number (351091407240).

Almost surely, 2^{2001221021211} is an apocalyptic number.

2001221021211 is a deficient number, since it is larger than the sum of its proper divisors (807510236709).

2001221021211 is a wasteful number, since it uses less digits than its factorization.

2001221021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35109140745.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2001221021211 its reverse (1121201221002), we get a palindrome (3122422242213).

The spelling of 2001221021211 in words is "two trillion, one billion, two hundred twenty-one million, twenty-one thousand, two hundred eleven".