99821192 has 8 divisors (see below), whose sum is σ = 187164750. Its totient is φ = 49910592.

The previous prime is 99821191. The next prime is 99821213. The reversal of 99821192 is 29112899.

It can be written as a sum of positive squares in only one way, i.e., 78605956 + 21215236 = 8866^2 + 4606^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (99821191) 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 as a sum of consecutive naturals, namely, 6238817 + ... + 6238832.

Almost surely, 2^99821192 is an apocalyptic number.

It is an amenable number.

99821192 is a deficient number, since it is larger than the sum of its proper divisors (87343558).

99821192 is a wasteful number, since it uses less digits than its factorization.

99821192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12477655 (or 12477651 counting only the distinct ones).

The product of its digits is 23328, while the sum is 41.

The square root of 99821192 is about 9991.0555998853. The cubic root of 99821192 is about 463.8820672338.

The spelling of 99821192 in words is "ninety-nine million, eight hundred twenty-one thousand, one hundred ninety-two".