199447721804 has 36 divisors (see below), whose sum is σ = 368711107128. Its totient is φ = 94387896000.

The previous prime is 199447721801. The next prime is 199447721833. The reversal of 199447721804 is 408127744991.

It is a self number, because there is not a number n which added to its sum of digits gives 199447721804.

It is not an unprimeable number, because it can be changed into a prime (199447721801) 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 11 ways as a sum of consecutive naturals, for example, 1512104 + ... + 1638704.

It is an arithmetic number, because the mean of its divisors is an integer number (10241975198).

Almost surely, 2^199447721804 is an apocalyptic number.

It is an amenable number.

199447721804 is a deficient number, since it is larger than the sum of its proper divisors (169263385324).

199447721804 is a wasteful number, since it uses less digits than its factorization.

199447721804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127734 (or 127713 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 56.

The spelling of 199447721804 in words is "one hundred ninety-nine billion, four hundred forty-seven million, seven hundred twenty-one thousand, eight hundred four".