99413821 has 8 divisors (see below), whose sum is σ = 107491104. Its totient is φ = 91398000.

The previous prime is 99413819. The next prime is 99413887. The reversal of 99413821 is 12831499.

It is the 4071-st star number.

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 99413821 - 2¹ = 99413819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99483821) 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 7 ways as a sum of consecutive naturals, for example, 11971 + ... + 18496.

It is an arithmetic number, because the mean of its divisors is an integer number (13436388).

Almost surely, 2^99413821 is an apocalyptic number.

It is an amenable number.

99413821 is a deficient number, since it is larger than the sum of its proper divisors (8077283).

99413821 is a wasteful number, since it uses less digits than its factorization.

99413821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30731.

The product of its digits is 15552, while the sum is 37.

The square root of 99413821 is about 9970.6479729253. The cubic root of 99413821 is about 463.2501715153.

The spelling of 99413821 in words is "ninety-nine million, four hundred thirteen thousand, eight hundred twenty-one".