11131212112 has 20 divisors (see below), whose sum is σ = 22504407840. Its totient is φ = 5323623008.

The previous prime is 11131212097. The next prime is 11131212119. The reversal of 11131212112 is 21121213111.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15123562 + ... + 15124297.

It is an arithmetic number, because the mean of its divisors is an integer number (1125220392).

Almost surely, 2^11131212112 is an apocalyptic number.

It is an amenable number.

11131212112 is an abundant number, since it is smaller than the sum of its proper divisors (11373195728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11131212112 is a wasteful number, since it uses less digits than its factorization.

11131212112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30247890 (or 30247884 counting only the distinct ones).

The product of its digits is 24, while the sum is 16.

Adding to 11131212112 its reverse (21121213111), we get a palindrome (32252425223).

Subtracting 11131212112 from its reverse (21121213111), we obtain a palindrome (9990000999).

The spelling of 11131212112 in words is "eleven billion, one hundred thirty-one million, two hundred twelve thousand, one hundred twelve".