221171017 has 2 divisors, whose sum is σ = 221171018. Its totient is φ = 221171016.

The previous prime is 221171011. The next prime is 221171021. The reversal of 221171017 is 710171122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176066361 + 45104656 = 13269^2 + 6716^2 .

It is a cyclic number.

It is not a de Polignac number, because 221171017 - 2⁷ = 221170889 is a prime.

It is not a weakly prime, because it can be changed into another prime (221171011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110585508 + 110585509.

It is an arithmetic number, because the mean of its divisors is an integer number (110585509).

Almost surely, 2^221171017 is an apocalyptic number.

It is an amenable number.

221171017 is a deficient number, since it is larger than the sum of its proper divisors (1).

221171017 is an equidigital number, since it uses as much as digits as its factorization.

221171017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 196, while the sum is 22.

The square root of 221171017 is about 14871.8195591528. The cubic root of 221171017 is about 604.7502709959.

The spelling of 221171017 in words is "two hundred twenty-one million, one hundred seventy-one thousand, seventeen".