111221211202111 has 4 divisors (see below), whose sum is σ = 111264104074432. Its totient is φ = 111178318329792.

The previous prime is 111221211202061. The next prime is 111221211202159. The reversal of 111221211202111 is 111202112122111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111221211202111 - 2¹⁷ = 111221211071039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221211206111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21446432271 + ... + 21446437456.

It is an arithmetic number, because the mean of its divisors is an integer number (27816026018608).

Almost surely, 2^{111221211202111} is an apocalyptic number.

111221211202111 is a deficient number, since it is larger than the sum of its proper divisors (42892872321).

111221211202111 is an equidigital number, since it uses as much as digits as its factorization.

111221211202111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42892872320.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 111221211202111 its reverse (111202112122111), we get a palindrome (222423323324222).

The spelling of 111221211202111 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred eleven million, two hundred two thousand, one hundred eleven".