201211121 has 4 divisors (see below), whose sum is σ = 211801200. Its totient is φ = 190621044.

The previous prime is 201211097. The next prime is 201211139. The reversal of 201211121 is 121112102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201211121 - 2¹⁸ = 200948977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201211321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5295011 + ... + 5295048.

It is an arithmetic number, because the mean of its divisors is an integer number (52950300).

Almost surely, 2^201211121 is an apocalyptic number.

It is an amenable number.

201211121 is a deficient number, since it is larger than the sum of its proper divisors (10590079).

201211121 is a wasteful number, since it uses less digits than its factorization.

201211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10590078.

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

The square root of 201211121 is about 14184.8905882280. The cubic root of 201211121 is about 585.9816192831.

Adding to 201211121 its reverse (121112102), we get a palindrome (322323223).

The spelling of 201211121 in words is "two hundred one million, two hundred eleven thousand, one hundred twenty-one".