111121112212121 has 8 divisors (see below), whose sum is σ = 122355957033504. Its totient is φ = 100075088312320.

The previous prime is 111121112212069. The next prime is 111121112212141. The reversal of 111121112212121 is 121212211121111.

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

It is not a de Polignac number, because 111121112212121 - 2¹⁰ = 111121112211097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111121112212093 and 111121112212102.

It is not an unprimeable number, because it can be changed into a prime (111121112212141) 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, 47205229160 + ... + 47205231513.

It is an arithmetic number, because the mean of its divisors is an integer number (15294494629188).

Almost surely, 2^{111121112212121} is an apocalyptic number.

111121112212121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111121112212121 is a deficient number, since it is larger than the sum of its proper divisors (11234844821383).

111121112212121 is a wasteful number, since it uses less digits than its factorization.

111121112212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94410460791.

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

Adding to 111121112212121 its reverse (121212211121111), we get a palindrome (232333323333232).

The spelling of 111121112212121 in words is "one hundred eleven trillion, one hundred twenty-one billion, one hundred twelve million, two hundred twelve thousand, one hundred twenty-one".