111212201220121 has 16 divisors (see below), whose sum is σ = 120066913733760. Its totient is φ = 102693524053120.

The previous prime is 111212201220103. The next prime is 111212201220193. The reversal of 111212201220121 is 121022102212111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 111212201220121 - 2³⁵ = 111177841481753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111212201220521) 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, 7821055 + ... + 16840228.

It is an arithmetic number, because the mean of its divisors is an integer number (7504182108360).

Almost surely, 2^{111212201220121} is an apocalyptic number.

It is an amenable number.

111212201220121 is a deficient number, since it is larger than the sum of its proper divisors (8854712513639).

111212201220121 is a wasteful number, since it uses less digits than its factorization.

111212201220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24668096.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 111212201220121 its reverse (121022102212111), we get a palindrome (232234303432232).

The spelling of 111212201220121 in words is "one hundred eleven trillion, two hundred twelve billion, two hundred one million, two hundred twenty thousand, one hundred twenty-one".