99821812899 has 8 divisors (see below), whose sum is σ = 140924912400. Its totient is φ = 62633294336.

The previous prime is 99821812823. The next prime is 99821812957.

99821812899 is nontrivially palindromic in base 10.

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 99821812899 - 2¹² = 99821808803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99821812099) 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, 978645174 + ... + 978645275.

It is an arithmetic number, because the mean of its divisors is an integer number (17615614050).

Almost surely, 2^99821812899 is an apocalyptic number.

99821812899 is a deficient number, since it is larger than the sum of its proper divisors (41103099501).

99821812899 is a wasteful number, since it uses less digits than its factorization.

99821812899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1957290469.

The product of its digits is 13436928, while the sum is 66.

The spelling of 99821812899 in words is "ninety-nine billion, eight hundred twenty-one million, eight hundred twelve thousand, eight hundred ninety-nine".