113121211111 has 4 divisors (see below), whose sum is σ = 113127067800. Its totient is φ = 113115354424.

The previous prime is 113121211097. The next prime is 113121211123. The reversal of 113121211111 is 111112121311.

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-113121211111 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 (113121215111) 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, 2899276 + ... + 2938033.

It is an arithmetic number, because the mean of its divisors is an integer number (28281766950).

Almost surely, 2^113121211111 is an apocalyptic number.

113121211111 is a deficient number, since it is larger than the sum of its proper divisors (5856689).

113121211111 is an equidigital number, since it uses as much as digits as its factorization.

113121211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5856688.

The product of its digits is 12, while the sum is 16.

Adding to 113121211111 its reverse (111112121311), we get a palindrome (224233332422).

The spelling of 113121211111 in words is "one hundred thirteen billion, one hundred twenty-one million, two hundred eleven thousand, one hundred eleven".