199521235684 has 9 divisors (see below), whose sum is σ = 349163725827. Its totient is φ = 99760171164.

The previous prime is 199521235657. The next prime is 199521235687. The reversal of 199521235684 is 486532125991.

The square root of 199521235684 is 446678.

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

199521235684 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199521235687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 781687 + ... + 1005025.

Almost surely, 2^199521235684 is an apocalyptic number.

199521235684 is the 446678-th square number.

It is an amenable number.

199521235684 is a deficient number, since it is larger than the sum of its proper divisors (149642490143).

199521235684 is an frugal number, since it uses more digits than its factorization.

199521235684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446682 (or 223341 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 55.

The spelling of 199521235684 in words is "one hundred ninety-nine billion, five hundred twenty-one million, two hundred thirty-five thousand, six hundred eighty-four".