2001022111 has 32 divisors (see below), whose sum is σ = 2362348800. Its totient is φ = 1674631680.

The previous prime is 2001022099. The next prime is 2001022117. The reversal of 2001022111 is 1112201002.

It is a cyclic number.

It is not a de Polignac number, because 2001022111 - 2⁷ = 2001021983 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 (2001022117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3232360 + ... + 3232978.

It is an arithmetic number, because the mean of its divisors is an integer number (73823400).

Almost surely, 2^2001022111 is an apocalyptic number.

2001022111 is a deficient number, since it is larger than the sum of its proper divisors (361326689).

2001022111 is a wasteful number, since it uses less digits than its factorization.

2001022111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 2001022111 is about 44732.7856387236. The cubic root of 2001022111 is about 1260.1356432034.

Adding to 2001022111 its reverse (1112201002), we get a palindrome (3113223113).

The spelling of 2001022111 in words is "two billion, one million, twenty-two thousand, one hundred eleven".