221212101111 has 8 divisors (see below), whose sum is σ = 296014268784. Its totient is φ = 146942333760.

The previous prime is 221212101101. The next prime is 221212101113. The reversal of 221212101111 is 111101212122.

It is a happy number.

221212101111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221212101111 - 2⁵ = 221212101079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212101113) 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 7 ways as a sum of consecutive naturals, for example, 133099110 + ... + 133100771.

It is an arithmetic number, because the mean of its divisors is an integer number (37001783598).

Almost surely, 2^221212101111 is an apocalyptic number.

221212101111 is a deficient number, since it is larger than the sum of its proper divisors (74802167673).

221212101111 is a wasteful number, since it uses less digits than its factorization.

221212101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266200161.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221212101111 its reverse (111101212122), we get a palindrome (332313313233).

The spelling of 221212101111 in words is "two hundred twenty-one billion, two hundred twelve million, one hundred one thousand, one hundred eleven".