2001212111 has 4 divisors (see below), whose sum is σ = 2001392352. Its totient is φ = 2001031872.

The previous prime is 2001212093. The next prime is 2001212117. The reversal of 2001212111 is 1112121002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1112121002 = 2 ⋅556060501.

It is a cyclic number.

It is not a de Polignac number, because 2001212111 - 2⁶ = 2001212047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001212092 and 2001212101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001212117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72290 + ... + 96063.

It is an arithmetic number, because the mean of its divisors is an integer number (500348088).

Almost surely, 2^2001212111 is an apocalyptic number.

2001212111 is a deficient number, since it is larger than the sum of its proper divisors (180241).

2001212111 is a wasteful number, since it uses less digits than its factorization.

2001212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180240.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 2001212111 is about 44734.9093102914. The cubic root of 2001212111 is about 1260.1755258536.

Adding to 2001212111 its reverse (1112121002), we get a palindrome (3113333113).

It can be divided in two parts, 20012 and 12111, that added together give a palindrome (32123).

The spelling of 2001212111 in words is "two billion, one million, two hundred twelve thousand, one hundred eleven".