2001221022111 has 16 divisors (see below), whose sum is σ = 2784347260416. Its totient is φ = 1276122722336.

The previous prime is 2001221022103. The next prime is 2001221022113. The reversal of 2001221022111 is 1112201221002.

It is a cyclic number.

It is not a de Polignac number, because 2001221022111 - 2³ = 2001221022103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001221022113) 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, 5999521 + ... + 6324293.

It is an arithmetic number, because the mean of its divisors is an integer number (174021703776).

Almost surely, 2^{2001221022111} is an apocalyptic number.

2001221022111 is a deficient number, since it is larger than the sum of its proper divisors (783126238305).

2001221022111 is a wasteful number, since it uses less digits than its factorization.

2001221022111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414102.

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

Adding to 2001221022111 its reverse (1112201221002), we get a palindrome (3113422243113).

The spelling of 2001221022111 in words is "two trillion, one billion, two hundred twenty-one million, twenty-two thousand, one hundred eleven".