11111212101111 has 32 divisors (see below), whose sum is σ = 15161178432000. Its totient is φ = 7236161412480.

The previous prime is 11111212101037. The next prime is 11111212101163. The reversal of 11111212101111 is 11110121211111.

It is a happy number.

It is not a de Polignac number, because 11111212101111 - 2¹¹ = 11111212099063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111212100111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19641205 + ... + 20198993.

It is an arithmetic number, because the mean of its divisors is an integer number (473786826000).

Almost surely, 2^{11111212101111} is an apocalyptic number.

11111212101111 is a deficient number, since it is larger than the sum of its proper divisors (4049966330889).

11111212101111 is a wasteful number, since it uses less digits than its factorization.

11111212101111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558599.

The product of its (nonzero) digits is 4, while the sum is 15.

Adding to 11111212101111 its reverse (11110121211111), we get a palindrome (22221333312222).

The spelling of 11111212101111 in words is "eleven trillion, one hundred eleven billion, two hundred twelve million, one hundred one thousand, one hundred eleven".