111222120021121 has 4 divisors (see below), whose sum is σ = 111351900792132. Its totient is φ = 111092339250112.

The previous prime is 111222120021119. The next prime is 111222120021193. The reversal of 111222120021121 is 121120021222111.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 104561075211121 + 6661044810000 = 10225511^2 + 2580900^2 .

It is a cyclic number.

It is not a de Polignac number, because 111222120021121 - 2¹ = 111222120021119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111222120024121) 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, 64890384220 + ... + 64890385933.

It is an arithmetic number, because the mean of its divisors is an integer number (27837975198033).

Almost surely, 2^{111222120021121} is an apocalyptic number.

It is an amenable number.

111222120021121 is a deficient number, since it is larger than the sum of its proper divisors (129780771011).

111222120021121 is an equidigital number, since it uses as much as digits as its factorization.

111222120021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129780771010.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 111222120021121 its reverse (121120021222111), we get a palindrome (232342141243232).

The spelling of 111222120021121 in words is "one hundred eleven trillion, two hundred twenty-two billion, one hundred twenty million, twenty-one thousand, one hundred twenty-one".