111212222110121 has 16 divisors (see below), whose sum is σ = 124146146718528. Its totient is φ = 98749003953600.

The previous prime is 111212222110051. The next prime is 111212222110169. The reversal of 111212222110121 is 121011222212111.

It is a happy number.

It is not a de Polignac number, because 111212222110121 - 2³⁴ = 111195042240937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111212222110093 and 111212222110102.

It is not an unprimeable number, because it can be changed into a prime (111212222110181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24072455 + ... + 28317971.

It is an arithmetic number, because the mean of its divisors is an integer number (7759134169908).

Almost surely, 2^{111212222110121} is an apocalyptic number.

111212222110121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111212222110121 is a deficient number, since it is larger than the sum of its proper divisors (12933924608407).

111212222110121 is a wasteful number, since it uses less digits than its factorization.

111212222110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4300952.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 111212222110121 its reverse (121011222212111), we get a palindrome (232223444322232).

The spelling of 111212222110121 in words is "one hundred eleven trillion, two hundred twelve billion, two hundred twenty-two million, one hundred ten thousand, one hundred twenty-one".