199210009921 has 8 divisors (see below), whose sum is σ = 216077267840. Its totient is φ = 182563239312.

The previous prime is 199210009919. The next prime is 199210009967. The reversal of 199210009921 is 129900012991.

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 199210009921 - 2¹ = 199210009919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199210009121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55119945 + ... + 55123558.

It is an arithmetic number, because the mean of its divisors is an integer number (27009658480).

Almost surely, 2^199210009921 is an apocalyptic number.

It is an amenable number.

199210009921 is a deficient number, since it is larger than the sum of its proper divisors (16867257919).

199210009921 is a wasteful number, since it uses less digits than its factorization.

199210009921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110243655.

The product of its (nonzero) digits is 26244, while the sum is 43.

The spelling of 199210009921 in words is "one hundred ninety-nine billion, two hundred ten million, nine thousand, nine hundred twenty-one".