11111221112111 has 8 divisors (see below), whose sum is σ = 11126709870144. Its totient is φ = 11095734494880.

The previous prime is 11111221112107. The next prime is 11111221112129. The reversal of 11111221112111 is 11121112211111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11111221112111 - 2² = 11111221112107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11111221112111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111221112311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9996701 + ... + 11052441.

It is an arithmetic number, because the mean of its divisors is an integer number (1390838733768).

Almost surely, 2^{11111221112111} is an apocalyptic number.

11111221112111 is a deficient number, since it is larger than the sum of its proper divisors (15488758033).

11111221112111 is a wasteful number, since it uses less digits than its factorization.

11111221112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070401.

The product of its digits is 8, while the sum is 17.

Adding to 11111221112111 its reverse (11121112211111), we get a palindrome (22232333323222).

The spelling of 11111221112111 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-one million, one hundred twelve thousand, one hundred eleven".