111221220211121 has 4 divisors (see below), whose sum is σ = 111296829471744. Its totient is φ = 111145610950500.

The previous prime is 111221220211103. The next prime is 111221220211147. The reversal of 111221220211121 is 121112022122111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111221220211121 - 2³⁸ = 110946342304177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111221220211093 and 111221220211102.

It is not an unprimeable number, because it can be changed into a prime (111221220211181) 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, 37804628105 + ... + 37804631046.

It is an arithmetic number, because the mean of its divisors is an integer number (27824207367936).

Almost surely, 2^{111221220211121} is an apocalyptic number.

It is an amenable number.

111221220211121 is a deficient number, since it is larger than the sum of its proper divisors (75609260623).

111221220211121 is an equidigital number, since it uses as much as digits as its factorization.

111221220211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75609260622.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 111221220211121 its reverse (121112022122111), we get a palindrome (232333242333232).

The spelling of 111221220211121 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred twenty million, two hundred eleven thousand, one hundred twenty-one".