17240221 has 2 divisors, whose sum is σ = 17240222. Its totient is φ = 17240220.

The previous prime is 17240173. The next prime is 17240263. The reversal of 17240221 is 12204271.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17131321 + 108900 = 4139^2 + 330^2 .

It is an emirp because it is prime and its reverse (12204271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17240221 - 2¹⁵ = 17207453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17240281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8620110 + 8620111.

It is an arithmetic number, because the mean of its divisors is an integer number (8620111).

Almost surely, 2^17240221 is an apocalyptic number.

It is an amenable number.

17240221 is a deficient number, since it is larger than the sum of its proper divisors (1).

17240221 is an equidigital number, since it uses as much as digits as its factorization.

17240221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 17240221 is about 4152.1345113086. The cubic root of 17240221 is about 258.3336278410. Note that the first 3 decimals are identical.

Adding to 17240221 its reverse (12204271), we get a palindrome (29444492).

The spelling of 17240221 in words is "seventeen million, two hundred forty thousand, two hundred twenty-one".