221211100111 has 4 divisors (see below), whose sum is σ = 221219480800. Its totient is φ = 221202719424.

The previous prime is 221211100069. The next prime is 221211100133. The reversal of 221211100111 is 111001112122.

It is a happy number.

221211100111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221211100111 - 2⁷ = 221211099983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221211100091 and 221211100100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221211100151) 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, 4150626 + ... + 4203583.

It is an arithmetic number, because the mean of its divisors is an integer number (55304870200).

Almost surely, 2^221211100111 is an apocalyptic number.

221211100111 is a deficient number, since it is larger than the sum of its proper divisors (8380689).

221211100111 is an equidigital number, since it uses as much as digits as its factorization.

221211100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8380688.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 221211100111 its reverse (111001112122), we get a palindrome (332212212233).

The spelling of 221211100111 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred thousand, one hundred eleven".