170252221 has 2 divisors, whose sum is σ = 170252222. Its totient is φ = 170252220.

The previous prime is 170252219. The next prime is 170252231. The reversal of 170252221 is 122252071.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122102500 + 48149721 = 11050^2 + 6939^2 .

It is a cyclic number.

It is not a de Polignac number, because 170252221 - 2¹ = 170252219 is a prime.

Together with 170252219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 170252192 and 170252201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170252231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85126110 + 85126111.

It is an arithmetic number, because the mean of its divisors is an integer number (85126111).

Almost surely, 2^170252221 is an apocalyptic number.

It is an amenable number.

170252221 is a deficient number, since it is larger than the sum of its proper divisors (1).

170252221 is an equidigital number, since it uses as much as digits as its factorization.

170252221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 170252221 is about 13048.0734593272. The cubic root of 170252221 is about 554.2396546399.

The spelling of 170252221 in words is "one hundred seventy million, two hundred fifty-two thousand, two hundred twenty-one".