111212210221121 has 4 divisors (see below), whose sum is σ = 111215228474112. Its totient is φ = 111209191968132.

The previous prime is 111212210221019. The next prime is 111212210221129. The reversal of 111212210221121 is 121122012212111.

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 a de Polignac number, because none of the positive numbers 2^k-111212210221121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111212210221093 and 111212210221102.

It is not an unprimeable number, because it can be changed into a prime (111212210221129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1509071225 + ... + 1509144918.

It is an arithmetic number, because the mean of its divisors is an integer number (27803807118528).

Almost surely, 2^{111212210221121} is an apocalyptic number.

It is an amenable number.

111212210221121 is a deficient number, since it is larger than the sum of its proper divisors (3018252991).

111212210221121 is an equidigital number, since it uses as much as digits as its factorization.

111212210221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3018252990.

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

Adding to 111212210221121 its reverse (121122012212111), we get a palindrome (232334222433232).

The spelling of 111212210221121 in words is "one hundred eleven trillion, two hundred twelve billion, two hundred ten million, two hundred twenty-one thousand, one hundred twenty-one".