199180921 has 8 divisors (see below), whose sum is σ = 208978688. Its totient is φ = 189594000.

The previous prime is 199180913. The next prime is 199180937. The reversal of 199180921 is 129081991.

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 199180921 - 2³ = 199180913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199180951) 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, 50775 + ... + 54556.

It is an arithmetic number, because the mean of its divisors is an integer number (26122336).

Almost surely, 2^199180921 is an apocalyptic number.

It is an amenable number.

199180921 is a deficient number, since it is larger than the sum of its proper divisors (9797767).

199180921 is a wasteful number, since it uses less digits than its factorization.

199180921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105423.

The product of its (nonzero) digits is 11664, while the sum is 40.

The square root of 199180921 is about 14113.1470976533. The cubic root of 199180921 is about 584.0041214837.

The spelling of 199180921 in words is "one hundred ninety-nine million, one hundred eighty thousand, nine hundred twenty-one".