11131111213 has 4 divisors (see below), whose sum is σ = 11313588508. Its totient is φ = 10948633920.

The previous prime is 11131111207. The next prime is 11131111249. The reversal of 11131111213 is 31211113111.

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 829267209 + 10301844004 = 28797^2 + 101498^2 .

It is a cyclic number.

It is not a de Polignac number, because 11131111213 - 2⁹ = 11131110701 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 (11131121213) 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, 91238556 + ... + 91238677.

It is an arithmetic number, because the mean of its divisors is an integer number (2828397127).

Almost surely, 2^11131111213 is an apocalyptic number.

It is an amenable number.

11131111213 is a deficient number, since it is larger than the sum of its proper divisors (182477295).

11131111213 is an equidigital number, since it uses as much as digits as its factorization.

11131111213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182477294.

The product of its digits is 18, while the sum is 16.

Adding to 11131111213 its reverse (31211113111), we get a palindrome (42342224324).

The spelling of 11131111213 in words is "eleven billion, one hundred thirty-one million, one hundred eleven thousand, two hundred thirteen".