111111121201 has 4 divisors (see below), whose sum is σ = 111543460452. Its totient is φ = 110678781952.

The previous prime is 111111121189. The next prime is 111111121213. The reversal of 111111121201 is 102121111111.

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

It is an interprime number because it is at equal distance from previous prime (111111121189) and next prime (111111121213).

It can be written as a sum of positive squares in 2 ways, for example, as 78413440576 + 32697680625 = 280024^2 + 180825^2 .

It is a cyclic number.

It is not a de Polignac number, because 111111121201 - 2¹¹ = 111111119153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111111121241) 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, 216169240 + ... + 216169753.

It is an arithmetic number, because the mean of its divisors is an integer number (27885865113).

Almost surely, 2^111111121201 is an apocalyptic number.

It is an amenable number.

111111121201 is a deficient number, since it is larger than the sum of its proper divisors (432339251).

111111121201 is an equidigital number, since it uses as much as digits as its factorization.

111111121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432339250.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 111111121201 its reverse (102121111111), we get a palindrome (213232232312).

The spelling of 111111121201 in words is "one hundred eleven billion, one hundred eleven million, one hundred twenty-one thousand, two hundred one".