2001210111 has 16 divisors (see below), whose sum is σ = 2972392800. Its totient is φ = 1330703424.

The previous prime is 2001210109. The next prime is 2001210139. The reversal of 2001210111 is 1110121002.

It is a happy number.

It is not a de Polignac number, because 2001210111 - 2¹ = 2001210109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 2001210093 and 2001210102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001210181) 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, 84766 + ... + 105771.

It is an arithmetic number, because the mean of its divisors is an integer number (185774550).

Almost surely, 2^2001210111 is an apocalyptic number.

2001210111 is a deficient number, since it is larger than the sum of its proper divisors (971182689).

2001210111 is a wasteful number, since it uses less digits than its factorization.

2001210111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190935 (or 190929 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 2001210111 is about 44734.8869563789. The cubic root of 2001210111 is about 1260.1751060493.

Adding to 2001210111 its reverse (1110121002), we get a palindrome (3111331113).

The spelling of 2001210111 in words is "two billion, one million, two hundred ten thousand, one hundred eleven".