17144221 has 2 divisors, whose sum is σ = 17144222. Its totient is φ = 17144220.

The previous prime is 17144219. The next prime is 17144227. The reversal of 17144221 is 12244171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15912121 + 1232100 = 3989^2 + 1110^2 .

It is a cyclic number.

It is not a de Polignac number, because 17144221 - 2¹ = 17144219 is a prime.

Together with 17144219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 17144192 and 17144201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17144227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8572110 + 8572111.

It is an arithmetic number, because the mean of its divisors is an integer number (8572111).

Almost surely, 2^17144221 is an apocalyptic number.

It is an amenable number.

17144221 is a deficient number, since it is larger than the sum of its proper divisors (1).

17144221 is an equidigital number, since it uses as much as digits as its factorization.

17144221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 448, while the sum is 22.

The square root of 17144221 is about 4140.5580541758. The cubic root of 17144221 is about 257.8532356398.

Adding to 17144221 its reverse (12244171), we get a palindrome (29388392).

The spelling of 17144221 in words is "seventeen million, one hundred forty-four thousand, two hundred twenty-one".