201221417 has 2 divisors, whose sum is σ = 201221418. Its totient is φ = 201221416.

The previous prime is 201221389. The next prime is 201221431. The reversal of 201221417 is 714122102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195552256 + 5669161 = 13984^2 + 2381^2 .

It is a cyclic number.

It is not a de Polignac number, because 201221417 - 2⁸ = 201221161 is a prime.

It is not a weakly prime, because it can be changed into another prime (201221477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610708 + 100610709.

It is an arithmetic number, because the mean of its divisors is an integer number (100610709).

Almost surely, 2^201221417 is an apocalyptic number.

It is an amenable number.

201221417 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221417 is an equidigital number, since it uses as much as digits as its factorization.

201221417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 201221417 is about 14185.2535049607. The cubic root of 201221417 is about 585.9916140320.

Adding to 201221417 its reverse (714122102), we get a palindrome (915343519).

The spelling of 201221417 in words is "two hundred one million, two hundred twenty-one thousand, four hundred seventeen".