11111111221012 has 24 divisors (see below), whose sum is σ = 21212470877472. Its totient is φ = 5050421896800.

The previous prime is 11111111220983. The next prime is 11111111221031. The reversal of 11111111221012 is 21012211111111.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 661687 + ... + 4760257.

It is an arithmetic number, because the mean of its divisors is an integer number (883852953228).

Almost surely, 2^{11111111221012} is an apocalyptic number.

It is an amenable number.

11111111221012 is a deficient number, since it is larger than the sum of its proper divisors (10101359656460).

11111111221012 is a wasteful number, since it uses less digits than its factorization.

11111111221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4160199 (or 4160197 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 11111111221012 its reverse (21012211111111), we get a palindrome (32123322332123).

The spelling of 11111111221012 in words is "eleven trillion, one hundred eleven billion, one hundred eleven million, two hundred twenty-one thousand, twelve".