99211209 has 8 divisors (see below), whose sum is σ = 132632160. Its totient is φ = 65965536.

The previous prime is 99211199. The next prime is 99211249. The reversal of 99211209 is 90211299.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99211209 - 2⁷ = 99211081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99211209.

It is not an unprimeable number, because it can be changed into a prime (99211249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42492 + ... + 44765.

It is an arithmetic number, because the mean of its divisors is an integer number (16579020).

Almost surely, 2^99211209 is an apocalyptic number.

It is an amenable number.

99211209 is a deficient number, since it is larger than the sum of its proper divisors (33420951).

99211209 is a wasteful number, since it uses less digits than its factorization.

99211209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87639.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 99211209 is about 9960.4823678374. The cubic root of 99211209 is about 462.9352458861.

The spelling of 99211209 in words is "ninety-nine million, two hundred eleven thousand, two hundred nine".