111121222021111 has 4 divisors (see below), whose sum is σ = 113217848851752. Its totient is φ = 109024595190472.

The previous prime is 111121222021079. The next prime is 111121222021123. The reversal of 111121222021111 is 111120222121111.

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 111121222021111 - 2⁵ = 111121222021079 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 (111121222021151) 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, 1048313415241 + ... + 1048313415346.

It is an arithmetic number, because the mean of its divisors is an integer number (28304462212938).

Almost surely, 2^{111121222021111} is an apocalyptic number.

111121222021111 is a deficient number, since it is larger than the sum of its proper divisors (2096626830641).

111121222021111 is an equidigital number, since it uses as much as digits as its factorization.

111121222021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2096626830640.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 111121222021111 its reverse (111120222121111), we get a palindrome (222241444142222).

The spelling of 111121222021111 in words is "one hundred eleven trillion, one hundred twenty-one billion, two hundred twenty-two million, twenty-one thousand, one hundred eleven".