11212121212 has 24 divisors (see below), whose sum is σ = 19780588800. Its totient is φ = 5560708416.

The previous prime is 11212121209. The next prime is 11212121233. The reversal of 11212121212 is 21212121211.

11212121212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

11212121212 is a modest number, since divided by 121212 gives 11212 as remainder.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 223653 + ... + 269155.

It is an arithmetic number, because the mean of its divisors is an integer number (824191200).

Almost surely, 2^11212121212 is an apocalyptic number.

It is an amenable number.

11212121212 is a deficient number, since it is larger than the sum of its proper divisors (8568467588).

11212121212 is a wasteful number, since it uses less digits than its factorization.

11212121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46005 (or 46003 counting only the distinct ones).

The product of its digits is 32, while the sum is 16.

Adding to 11212121212 its reverse (21212121211), we get a palindrome (32424242423).

Subtracting 11212121212 from its reverse (21212121211), we obtain a palindrome (9999999999).

It can be divided in two parts, 11 and 212121212, that multiplied together give a palindrome (2333333332).

The spelling of 11212121212 in words is "eleven billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twelve".