111221101010999 has 4 divisors (see below), whose sum is σ = 127109829726864. Its totient is φ = 95332372295136.

The previous prime is 111221101010947. The next prime is 111221101011047. The reversal of 111221101010999 is 999010101122111.

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 111221101010999 - 2¹⁶ = 111221100945463 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 (111221101010599) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7944364357922 + ... + 7944364357935.

It is an arithmetic number, because the mean of its divisors is an integer number (31777457431716).

Almost surely, 2^{111221101010999} is an apocalyptic number.

111221101010999 is a deficient number, since it is larger than the sum of its proper divisors (15888728715865).

111221101010999 is an equidigital number, since it uses as much as digits as its factorization.

111221101010999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15888728715864.

The product of its (nonzero) digits is 2916, while the sum is 38.

The spelling of 111221101010999 in words is "one hundred eleven trillion, two hundred twenty-one billion, one hundred one million, ten thousand, nine hundred ninety-nine".