111121222021211 has 4 divisors (see below), whose sum is σ = 111258239558424. Its totient is φ = 110984204484000.

The previous prime is 111121222021193. The next prime is 111121222021213. The reversal of 111121222021211 is 112120222121111.

It is a happy number.

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 111121222021211 - 2⁴⁶ = 40752477843547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111121222021213) 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, 68508767390 + ... + 68508769011.

It is an arithmetic number, because the mean of its divisors is an integer number (27814559889606).

Almost surely, 2^{111121222021211} is an apocalyptic number.

111121222021211 is a deficient number, since it is larger than the sum of its proper divisors (137017537213).

111121222021211 is an equidigital number, since it uses as much as digits as its factorization.

111121222021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137017537212.

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

Adding to 111121222021211 its reverse (112120222121111), we get a palindrome (223241444142322).

The spelling of 111121222021211 in words is "one hundred eleven trillion, one hundred twenty-one billion, two hundred twenty-two million, twenty-one thousand, two hundred eleven".