201112121 has 12 divisors (see below), whose sum is σ = 234526500. Its totient is φ = 171954720.

The previous prime is 201112111. The next prime is 201112189. The reversal of 201112121 is 121211102.

It can be written as a sum of positive squares in 2 ways, for example, as 10368400 + 190743721 = 3220^2 + 13811^2 .

It is a de Polignac number, because none of the positive numbers 2^k-201112121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201112111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15755 + ... + 25503.

It is an arithmetic number, because the mean of its divisors is an integer number (19543875).

Almost surely, 2^201112121 is an apocalyptic number.

It is an amenable number.

201112121 is a deficient number, since it is larger than the sum of its proper divisors (33414379).

201112121 is an equidigital number, since it uses as much as digits as its factorization.

201112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10184 (or 10177 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 201112121 is about 14181.4005302720. The cubic root of 201112121 is about 585.8854985237.

Adding to 201112121 its reverse (121211102), we get a palindrome (322323223).

The spelling of 201112121 in words is "two hundred one million, one hundred twelve thousand, one hundred twenty-one".