12111021211111 has 4 divisors (see below), whose sum is σ = 12114424142800. Its totient is φ = 12107618279424.

The previous prime is 12111021211033. The next prime is 12111021211147. The reversal of 12111021211111 is 11111212011121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12111021211111 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 (12111721211111) 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, 1701460506 + ... + 1701467623.

It is an arithmetic number, because the mean of its divisors is an integer number (3028606035700).

Almost surely, 2^{12111021211111} is an apocalyptic number.

12111021211111 is a deficient number, since it is larger than the sum of its proper divisors (3402931689).

12111021211111 is an equidigital number, since it uses as much as digits as its factorization.

12111021211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3402931688.

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 12111021211111 its reverse (11111212011121), we get a palindrome (23222233222232).

The spelling of 12111021211111 in words is "twelve trillion, one hundred eleven billion, twenty-one million, two hundred eleven thousand, one hundred eleven".