199328921 has 8 divisors (see below), whose sum is σ = 222753888. Its totient is φ = 176788000.

The previous prime is 199328917. The next prime is 199328989. The reversal of 199328921 is 129823991.

It is a happy number.

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 199328921 - 2² = 199328917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199328911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220535 + ... + 221436.

It is an arithmetic number, because the mean of its divisors is an integer number (27844236).

Almost surely, 2^199328921 is an apocalyptic number.

199328921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

199328921 is a deficient number, since it is larger than the sum of its proper divisors (23424967).

199328921 is a wasteful number, since it uses less digits than its factorization.

199328921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442023.

The product of its digits is 69984, while the sum is 44.

The square root of 199328921 is about 14118.3894619748. The cubic root of 199328921 is about 584.1487324077.

The spelling of 199328921 in words is "one hundred ninety-nine million, three hundred twenty-eight thousand, nine hundred twenty-one".