171060221 has 2 divisors, whose sum is σ = 171060222. Its totient is φ = 171060220.

The previous prime is 171060217. The next prime is 171060247. The reversal of 171060221 is 122060171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105288121 + 65772100 = 10261^2 + 8110^2 .

It is an emirp because it is prime and its reverse (122060171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 171060221 - 2² = 171060217 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 171060193 and 171060202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171060251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85530110 + 85530111.

It is an arithmetic number, because the mean of its divisors is an integer number (85530111).

Almost surely, 2^171060221 is an apocalyptic number.

It is an amenable number.

171060221 is a deficient number, since it is larger than the sum of its proper divisors (1).

171060221 is an equidigital number, since it uses as much as digits as its factorization.

171060221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 171060221 is about 13078.9992354155. Note that the first 3 decimals coincide. The cubic root of 171060221 is about 555.1150598771.

Adding to 171060221 its sum of digits (20), we get a square (171060241 = 13079²).

Subtracting from 171060221 its reverse (122060171), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 171060221 in words is "one hundred seventy-one million, sixty thousand, two hundred twenty-one".