111201111112121 has 4 divisors (see below), whose sum is σ = 111201174406644. Its totient is φ = 111201047817600.

The previous prime is 111201111112109. The next prime is 111201111112129. The reversal of 111201111112121 is 121211111102111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23605644142096 + 87595466970025 = 4858564^2 + 9359245^2 .

It is a cyclic number.

It is not a de Polignac number, because 111201111112121 - 2¹⁸ = 111201110849977 is a prime.

It is a super-2 number, since 2×111201111112121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 111201111112121.

It is not an unprimeable number, because it can be changed into a prime (111201111112129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28934420 + ... + 32551541.

It is an arithmetic number, because the mean of its divisors is an integer number (27800293601661).

Almost surely, 2^{111201111112121} is an apocalyptic number.

It is an amenable number.

111201111112121 is a deficient number, since it is larger than the sum of its proper divisors (63294523).

111201111112121 is an equidigital number, since it uses as much as digits as its factorization.

111201111112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63294522.

The product of its (nonzero) digits is 8, while the sum is 17.

Adding to 111201111112121 its reverse (121211111102111), we get a palindrome (232412222214232).

The spelling of 111201111112121 in words is "one hundred eleven trillion, two hundred one billion, one hundred eleven million, one hundred twelve thousand, one hundred twenty-one".