201121 has 2 divisors, whose sum is σ = 201122. Its totient is φ = 201120.

The previous prime is 201119. The next prime is 201139. The reversal of 201121 is 121102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190096 + 11025 = 436^2 + 105^2 .

It is a cyclic number.

It is not a de Polignac number, because 201121 - 2¹ = 201119 is a prime.

Together with 201119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (201101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100560 + 100561.

It is an arithmetic number, because the mean of its divisors is an integer number (100561).

2²⁰¹¹²¹ is an apocalyptic number.

It is an amenable number.

201121 is a deficient number, since it is larger than the sum of its proper divisors (1).

201121 is an equidigital number, since it uses as much as digits as its factorization.

201121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 201121 is about 448.4651602968. The cubic root of 201121 is about 58.5894120581.

Adding to 201121 its reverse (121102), we get a palindrome (322223).

The spelling of 201121 in words is "two hundred one thousand, one hundred twenty-one", and thus it is an iban number.