201221017 has 2 divisors, whose sum is σ = 201221018. Its totient is φ = 201221016.

The previous prime is 201221011. The next prime is 201221099. The reversal of 201221017 is 710122102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106275481 + 94945536 = 10309^2 + 9744^2 .

It is a cyclic number.

It is not a de Polignac number, because 201221017 - 2¹⁵ = 201188249 is a prime.

It is not a weakly prime, because it can be changed into another prime (201221011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610508 + 100610509.

It is an arithmetic number, because the mean of its divisors is an integer number (100610509).

Almost surely, 2^201221017 is an apocalyptic number.

It is an amenable number.

201221017 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221017 is an equidigital number, since it uses as much as digits as its factorization.

201221017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 201221017 is about 14185.2394058049. The cubic root of 201221017 is about 585.9912257420.

Adding to 201221017 its reverse (710122102), we get a palindrome (911343119).

The spelling of 201221017 in words is "two hundred one million, two hundred twenty-one thousand, seventeen".