201442001221 has 2 divisors, whose sum is σ = 201442001222. Its totient is φ = 201442001220.

The previous prime is 201442001197. The next prime is 201442001249. The reversal of 201442001221 is 122100244102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199786650625 + 1655350596 = 446975^2 + 40686^2 .

It is a cyclic number.

It is not a de Polignac number, because 201442001221 - 2²³ = 201433612613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201442001251) 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, 100721000610 + 100721000611.

It is an arithmetic number, because the mean of its divisors is an integer number (100721000611).

Almost surely, 2^201442001221 is an apocalyptic number.

It is an amenable number.

201442001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

201442001221 is an equidigital number, since it uses as much as digits as its factorization.

201442001221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 201442001221 its reverse (122100244102), we get a palindrome (323542245323).

The spelling of 201442001221 in words is "two hundred one billion, four hundred forty-two million, one thousand, two hundred twenty-one".