2001221210111 has 8 divisors (see below), whose sum is σ = 2044995738240. Its totient is φ = 1957914859032.

The previous prime is 2001221210089. The next prime is 2001221210143. The reversal of 2001221210111 is 1110121221002.

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 2001221210111 - 2³⁴ = 1984041340927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001221210161) 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, 117035621 + ... + 117052718.

It is an arithmetic number, because the mean of its divisors is an integer number (255624467280).

Almost surely, 2^{2001221210111} is an apocalyptic number.

2001221210111 is a deficient number, since it is larger than the sum of its proper divisors (43774528129).

2001221210111 is a wasteful number, since it uses less digits than its factorization.

2001221210111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234088525.

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

Adding to 2001221210111 its reverse (1110121221002), we get a palindrome (3111342431113).

The spelling of 2001221210111 in words is "two trillion, one billion, two hundred twenty-one million, two hundred ten thousand, one hundred eleven".