99221187 has 8 divisors (see below), whose sum is σ = 142471504. Its totient is φ = 61059168.

The previous prime is 99221179. The next prime is 99221191. The reversal of 99221187 is 78112299.

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

It is not a de Polignac number, because 99221187 - 2³ = 99221179 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 2544133 = 99221187 / (9 + 9 + 2 + 2 + 1 + 1 + 8 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99221137) 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, 1272028 + ... + 1272105.

It is an arithmetic number, because the mean of its divisors is an integer number (17808938).

Almost surely, 2^99221187 is an apocalyptic number.

99221187 is a deficient number, since it is larger than the sum of its proper divisors (43250317).

99221187 is a wasteful number, since it uses less digits than its factorization.

99221187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2544149.

The product of its digits is 18144, while the sum is 39.

The square root of 99221187 is about 9960.9832346009. The cubic root of 99221187 is about 462.9507650097.

The spelling of 99221187 in words is "ninety-nine million, two hundred twenty-one thousand, one hundred eighty-seven".