201144421 has 2 divisors, whose sum is σ = 201144422. Its totient is φ = 201144420.

The previous prime is 201144403. The next prime is 201144451. The reversal of 201144421 is 124441102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192376900 + 8767521 = 13870^2 + 2961^2 .

It is a cyclic number.

It is not a de Polignac number, because 201144421 - 2¹⁵ = 201111653 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201144451) 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, 100572210 + 100572211.

It is an arithmetic number, because the mean of its divisors is an integer number (100572211).

Almost surely, 2^201144421 is an apocalyptic number.

It is an amenable number.

201144421 is a deficient number, since it is larger than the sum of its proper divisors (1).

201144421 is an equidigital number, since it uses as much as digits as its factorization.

201144421 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.

The square root of 201144421 is about 14182.5393001394. The cubic root of 201144421 is about 585.9168626014.

Adding to 201144421 its reverse (124441102), we get a palindrome (325585523).

The spelling of 201144421 in words is "two hundred one million, one hundred forty-four thousand, four hundred twenty-one".