17120221 has 2 divisors, whose sum is σ = 17120222. Its totient is φ = 17120220.

The previous prime is 17120203. The next prime is 17120227. The reversal of 17120221 is 12202171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8791225 + 8328996 = 2965^2 + 2886^2 .

It is an emirp because it is prime and its reverse (12202171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17120221 - 2⁵ = 17120189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 17120195 and 17120204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17120227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8560110 + 8560111.

It is an arithmetic number, because the mean of its divisors is an integer number (8560111).

Almost surely, 2^17120221 is an apocalyptic number.

It is an amenable number.

17120221 is a deficient number, since it is larger than the sum of its proper divisors (1).

17120221 is an equidigital number, since it uses as much as digits as its factorization.

17120221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 17120221 is about 4137.6588791248. The cubic root of 17120221 is about 257.7328575129.

Adding to 17120221 its reverse (12202171), we get a palindrome (29322392).

The spelling of 17120221 in words is "seventeen million, one hundred twenty thousand, two hundred twenty-one".