111211211222111 has 48 divisors (see below), whose sum is σ = 158368158681600. Its totient is φ = 75781970383680.

The previous prime is 111211211222107. The next prime is 111211211222117. The reversal of 111211211222111 is 111222112112111.

It is not a de Polignac number, because 111211211222111 - 2² = 111211211222107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211211222117) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 265580531 + ... + 265998948.

It is an arithmetic number, because the mean of its divisors is an integer number (3299336639200).

Almost surely, 2^{111211211222111} is an apocalyptic number.

111211211222111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111211211222111 is a deficient number, since it is larger than the sum of its proper divisors (47156947459489).

111211211222111 is a wasteful number, since it uses less digits than its factorization.

111211211222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531579540 (or 531579529 counting only the distinct ones).

The product of its digits is 32, while the sum is 20.

Adding to 111211211222111 its reverse (111222112112111), we get a palindrome (222433323334222).

The spelling of 111211211222111 in words is "one hundred eleven trillion, two hundred eleven billion, two hundred eleven million, two hundred twenty-two thousand, one hundred eleven".