17145000221 has 2 divisors, whose sum is σ = 17145000222. Its totient is φ = 17145000220.

The previous prime is 17145000203. The next prime is 17145000247. The reversal of 17145000221 is 12200054171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16541560996 + 603439225 = 128614^2 + 24565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17145000221 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17145000281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8572500110 + 8572500111.

It is an arithmetic number, because the mean of its divisors is an integer number (8572500111).

Almost surely, 2^17145000221 is an apocalyptic number.

It is an amenable number.

17145000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

17145000221 is an equidigital number, since it uses as much as digits as its factorization.

17145000221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 23.

Adding to 17145000221 its reverse (12200054171), we get a palindrome (29345054392).

The spelling of 17145000221 in words is "seventeen billion, one hundred forty-five million, two hundred twenty-one", and thus it is an aban number.