2131111122113 has 4 divisors (see below), whose sum is σ = 2132998732740. Its totient is φ = 2129223511488.

The previous prime is 2131111122109. The next prime is 2131111122131. The reversal of 2131111122113 is 3112211111312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 55171902769 + 2075939219344 = 234887^2 + 1440812^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131111122113 - 2² = 2131111122109 is a prime.

It is a super-2 number, since 2×2131111122113² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131111122103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 943803620 + ... + 943805877.

It is an arithmetic number, because the mean of its divisors is an integer number (533249683185).

Almost surely, 2^{2131111122113} is an apocalyptic number.

It is an amenable number.

2131111122113 is a deficient number, since it is larger than the sum of its proper divisors (1887610627).

2131111122113 is a wasteful number, since it uses less digits than its factorization.

2131111122113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1887610626.

The product of its digits is 72, while the sum is 20.

Adding to 2131111122113 its reverse (3112211111312), we get a palindrome (5243322233425).

The spelling of 2131111122113 in words is "two trillion, one hundred thirty-one billion, one hundred eleven million, one hundred twenty-two thousand, one hundred thirteen".