111212221212111 has 8 divisors (see below), whose sum is σ = 148283624935600. Its totient is φ = 74141149148352.

The previous prime is 111212221212091. The next prime is 111212221212119. The reversal of 111212221212111 is 111212122212111.

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

It is not a de Polignac number, because 111212221212111 - 2¹⁰ = 111212221211087 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 (111212221212119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82131460 + ... + 83474553.

It is an arithmetic number, because the mean of its divisors is an integer number (18535453116950).

Almost surely, 2^{111212221212111} is an apocalyptic number.

111212221212111 is a deficient number, since it is larger than the sum of its proper divisors (37071403723489).

111212221212111 is a wasteful number, since it uses less digits than its factorization.

111212221212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165829865.

The product of its digits is 64, while the sum is 21.

Adding to 111212221212111 its reverse (111212122212111), we get a palindrome (222424343424222).

The spelling of 111212221212111 in words is "one hundred eleven trillion, two hundred twelve billion, two hundred twenty-one million, two hundred twelve thousand, one hundred eleven".