170940170921 has 8 divisors (see below), whose sum is σ = 186611188680. Its totient is φ = 155629406592.

The previous prime is 170940170897. The next prime is 170940170971. The reversal of 170940170921 is 129071049071.

It can be written as a sum of positive squares in 4 ways, for example, as 5555615296 + 165384555625 = 74536^2 + 406675^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 170940170921 - 2³⁰ = 169866429097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (170940170971) 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 in 7 ways as a sum of consecutive naturals, for example, 90062366 + ... + 90064263.

It is an arithmetic number, because the mean of its divisors is an integer number (23326398585).

Almost surely, 2^170940170921 is an apocalyptic number.

It is an amenable number.

170940170921 is a deficient number, since it is larger than the sum of its proper divisors (15671017759).

170940170921 is a wasteful number, since it uses less digits than its factorization.

170940170921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180126715.

The product of its (nonzero) digits is 31752, while the sum is 41.

The spelling of 170940170921 in words is "one hundred seventy billion, nine hundred forty million, one hundred seventy thousand, nine hundred twenty-one".