201221441 has 2 divisors, whose sum is σ = 201221442. Its totient is φ = 201221440.

The previous prime is 201221431. The next prime is 201221477. The reversal of 201221441 is 144122102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143400625 + 57820816 = 11975^2 + 7604^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201221441 is a prime.

It is not a weakly prime, because it can be changed into another prime (201221431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610720 + 100610721.

It is an arithmetic number, because the mean of its divisors is an integer number (100610721).

Almost surely, 2^201221441 is an apocalyptic number.

It is an amenable number.

201221441 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221441 is an equidigital number, since it uses as much as digits as its factorization.

201221441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 201221441 is about 14185.2543509096. The cubic root of 201221441 is about 585.9916373294.

Adding to 201221441 its reverse (144122102), we get a palindrome (345343543).

The spelling of 201221441 in words is "two hundred one million, two hundred twenty-one thousand, four hundred forty-one".