199709495323321 has 9 divisors (see below), whose sum is σ = 199827721744549. Its totient is φ = 199591338833500.

The previous prime is 199709495323267. The next prime is 199709495323333. The reversal of 199709495323321 is 123323594907991.

The square root of 199709495323321 is 14131861.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 199709495323321 - 2⁴⁵ = 164525123234489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199709495323721) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 33224002206 + ... + 33224008216.

Almost surely, 2^{199709495323321} is an apocalyptic number.

199709495323321 is the 14131861-st square number.

199709495323321 is the 7065931-st centered octagonal number.

It is an amenable number.

199709495323321 is a deficient number, since it is larger than the sum of its proper divisors (118226421228).

199709495323321 is an frugal number, since it uses more digits than its factorization.

199709495323321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16724 (or 8362 counting only the distinct ones).

The product of its (nonzero) digits is 99202320, while the sum is 67.

The spelling of 199709495323321 in words is "one hundred ninety-nine trillion, seven hundred nine billion, four hundred ninety-five million, three hundred twenty-three thousand, three hundred twenty-one".