111100222021 has 2 divisors, whose sum is σ = 111100222022. Its totient is φ = 111100222020.

The previous prime is 111100222019. The next prime is 111100222039. The reversal of 111100222021 is 120222001111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110813088996 + 287133025 = 332886^2 + 16945^2 .

It is an emirp because it is prime and its reverse (120222001111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111100222021 - 2¹ = 111100222019 is a prime.

Together with 111100222019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 111100221992 and 111100222010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111100222091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55550111010 + 55550111011.

It is an arithmetic number, because the mean of its divisors is an integer number (55550111011).

Almost surely, 2^111100222021 is an apocalyptic number.

It is an amenable number.

111100222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111100222021 is an equidigital number, since it uses as much as digits as its factorization.

111100222021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 111100222021 its reverse (120222001111), we get a palindrome (231322223132).

The spelling of 111100222021 in words is "one hundred eleven billion, one hundred million, two hundred twenty-two thousand, twenty-one".