2001020111 has 4 divisors (see below), whose sum is σ = 2013296472. Its totient is φ = 1988743752.

The previous prime is 2001020101. The next prime is 2001020117. The reversal of 2001020111 is 1110201002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2001020111 - 2¹⁴ = 2001003727 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 (2001020117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6137936 + ... + 6138261.

It is an arithmetic number, because the mean of its divisors is an integer number (503324118).

Almost surely, 2^2001020111 is an apocalyptic number.

2001020111 is a deficient number, since it is larger than the sum of its proper divisors (12276361).

2001020111 is a wasteful number, since it uses less digits than its factorization.

2001020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12276360.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 2001020111 is about 44732.7632837499. The cubic root of 2001020111 is about 1260.1352233726.

Adding to 2001020111 its reverse (1110201002), we get a palindrome (3111221113).

The spelling of 2001020111 in words is "two billion, one million, twenty thousand, one hundred eleven".