321908612173 has 4 divisors (see below), whose sum is σ = 321958940380. Its totient is φ = 321858283968.

The previous prime is 321908612171. The next prime is 321908612197. The reversal of 321908612173 is 371216809123.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32278434244 + 289630177929 = 179662^2 + 538173^2 .

It is a cyclic number.

It is not a de Polignac number, because 321908612173 - 2¹ = 321908612171 is a prime.

It is a super-2 number, since 2×321908612173² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321908612171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25154508 + ... + 25167301.

It is an arithmetic number, because the mean of its divisors is an integer number (80489735095).

Almost surely, 2^321908612173 is an apocalyptic number.

It is an amenable number.

321908612173 is a deficient number, since it is larger than the sum of its proper divisors (50328207).

321908612173 is an equidigital number, since it uses as much as digits as its factorization.

321908612173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50328206.

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 321908612173 in words is "three hundred twenty-one billion, nine hundred eight million, six hundred twelve thousand, one hundred seventy-three".