201121171 has 2 divisors, whose sum is σ = 201121172. Its totient is φ = 201121170.

The previous prime is 201121157. The next prime is 201121183. The reversal of 201121171 is 171121102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201121171 is a prime.

It is a super-2 number, since 2×201121171² = 80899450848822482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201121111) 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 as a sum of consecutive naturals, namely, 100560585 + 100560586.

It is an arithmetic number, because the mean of its divisors is an integer number (100560586).

Almost surely, 2^201121171 is an apocalyptic number.

201121171 is a deficient number, since it is larger than the sum of its proper divisors (1).

201121171 is an equidigital number, since it uses as much as digits as its factorization.

201121171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 16.

The square root of 201121171 is about 14181.7196065921. The cubic root of 201121171 is about 585.8942866302.

Adding to 201121171 its reverse (171121102), we get a palindrome (372242273).

The spelling of 201121171 in words is "two hundred one million, one hundred twenty-one thousand, one hundred seventy-one".