111222222021021 has 4 divisors (see below), whose sum is σ = 148296296028032. Its totient is φ = 74148148014012.

The previous prime is 111222222021017. The next prime is 111222222021059. The reversal of 111222222021021 is 120120222222111.

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 not a de Polignac number, because 111222222021021 - 2² = 111222222021017 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 (111222222221021) 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, 18537037003501 + ... + 18537037003506.

It is an arithmetic number, because the mean of its divisors is an integer number (37074074007008).

Almost surely, 2^{111222222021021} is an apocalyptic number.

It is an amenable number.

111222222021021 is a deficient number, since it is larger than the sum of its proper divisors (37074074007011).

111222222021021 is an equidigital number, since it uses as much as digits as its factorization.

111222222021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37074074007010.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 111222222021021 its reverse (120120222222111), we get a palindrome (231342444243132).

The spelling of 111222222021021 in words is "one hundred eleven trillion, two hundred twenty-two billion, two hundred twenty-two million, twenty-one thousand, twenty-one".