11111111100012 has 144 divisors (see below), whose sum is σ = 32902137031680. Its totient is φ = 2885853398400.

The previous prime is 11111111099989. The next prime is 11111111100071. The reversal of 11111111100012 is 21000111111111.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 183136962 + ... + 183197622.

It is an arithmetic number, because the mean of its divisors is an integer number (228487062720).

Almost surely, 2^{11111111100012} is an apocalyptic number.

11111111100012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11111111100012 is an abundant number, since it is smaller than the sum of its proper divisors (21791025931668).

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

11111111100012 is a wasteful number, since it uses less digits than its factorization.

11111111100012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89012 (or 89003 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 12.

Adding to 11111111100012 its reverse (21000111111111), we get a palindrome (32111222211123).

The spelling of 11111111100012 in words is "eleven trillion, one hundred eleven billion, one hundred eleven million, one hundred thousand, twelve".