170741921921 has 2 divisors, whose sum is σ = 170741921922. Its totient is φ = 170741921920.

The previous prime is 170741921899. The next prime is 170741921927. The reversal of 170741921921 is 129129147071.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133251281296 + 37490640625 = 365036^2 + 193625^2 .

It is an emirp because it is prime and its reverse (129129147071) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 170741921921 - 2¹⁰ = 170741920897 is a prime.

It is not a weakly prime, because it can be changed into another prime (170741921927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85370960960 + 85370960961.

It is an arithmetic number, because the mean of its divisors is an integer number (85370960961).

Almost surely, 2^170741921921 is an apocalyptic number.

It is an amenable number.

170741921921 is a deficient number, since it is larger than the sum of its proper divisors (1).

170741921921 is an equidigital number, since it uses as much as digits as its factorization.

170741921921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 44.

The spelling of 170741921921 in words is "one hundred seventy billion, seven hundred forty-one million, nine hundred twenty-one thousand, nine hundred twenty-one".