11131212111 has 64 divisors (see below), whose sum is σ = 16821043200. Its totient is φ = 6505906176.

The previous prime is 11131212097. The next prime is 11131212119. The reversal of 11131212111 is 11121213111.

It is not a de Polignac number, because 11131212111 - 2⁶ = 11131212047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11131212119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 29063026 + ... + 29063408.

It is an arithmetic number, because the mean of its divisors is an integer number (262828800).

Almost surely, 2^11131212111 is an apocalyptic number.

11131212111 is a deficient number, since it is larger than the sum of its proper divisors (5689831089).

11131212111 is a wasteful number, since it uses less digits than its factorization.

11131212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848.

The product of its digits is 12, while the sum is 15.

Adding to 11131212111 its reverse (11121213111), we get a palindrome (22252425222).

The spelling of 11131212111 in words is "eleven billion, one hundred thirty-one million, two hundred twelve thousand, one hundred eleven".