99605221 has 8 divisors (see below), whose sum is σ = 102452864. Its totient is φ = 96765840.

The previous prime is 99605213. The next prime is 99605257. The reversal of 99605221 is 12250699.

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 99605221 - 2³ = 99605213 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 (99605281) 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, 28816 + ... + 32086.

It is an arithmetic number, because the mean of its divisors is an integer number (12806608).

Almost surely, 2^99605221 is an apocalyptic number.

It is an amenable number.

99605221 is a deficient number, since it is larger than the sum of its proper divisors (2847643).

99605221 is a wasteful number, since it uses less digits than its factorization.

99605221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4131.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 99605221 is about 9980.2415301434. The cubic root of 99605221 is about 463.5472772236.

The spelling of 99605221 in words is "ninety-nine million, six hundred five thousand, two hundred twenty-one".