2001212012111 has 4 divisors (see below), whose sum is σ = 2155151397672. Its totient is φ = 1847272626552.

The previous prime is 2001212012089. The next prime is 2001212012159. The reversal of 2001212012111 is 1112102121002.

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 2001212012111 - 2⁶ = 2001212012047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001212012911) 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, 76969692761 + ... + 76969692786.

It is an arithmetic number, because the mean of its divisors is an integer number (538787849418).

Almost surely, 2^{2001212012111} is an apocalyptic number.

2001212012111 is a deficient number, since it is larger than the sum of its proper divisors (153939385561).

2001212012111 is a wasteful number, since it uses less digits than its factorization.

2001212012111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153939385560.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2001212012111 its reverse (1112102121002), we get a palindrome (3113314133113).

The spelling of 2001212012111 in words is "two trillion, one billion, two hundred twelve million, twelve thousand, one hundred eleven".