11111321212 has 12 divisors (see below), whose sum is σ = 19522283256. Its totient is φ = 5533526000.

The previous prime is 11111321209. The next prime is 11111321219. The reversal of 11111321212 is 21212311111.

It is a happy number.

11111321212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×11111321212² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111321219) 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, 5532523 + ... + 5534530.

It is an arithmetic number, because the mean of its divisors is an integer number (1626856938).

Almost surely, 2^11111321212 is an apocalyptic number.

It is an amenable number.

11111321212 is a deficient number, since it is larger than the sum of its proper divisors (8410962044).

11111321212 is a wasteful number, since it uses less digits than its factorization.

11111321212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11067308 (or 11067306 counting only the distinct ones).

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

Adding to 11111321212 its reverse (21212311111), we get a palindrome (32323632323).

The spelling of 11111321212 in words is "eleven billion, one hundred eleven million, three hundred twenty-one thousand, two hundred twelve".