99211811 has 16 divisors (see below), whose sum is σ = 107440128. Its totient is φ = 91344000.

The previous prime is 99211781. The next prime is 99211831. The reversal of 99211811 is 11811299.

It is a cyclic number.

It is not a de Polignac number, because 99211811 - 2²⁶ = 32102947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99211831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 247211 + ... + 247611.

It is an arithmetic number, because the mean of its divisors is an integer number (6715008).

Almost surely, 2^99211811 is an apocalyptic number.

99211811 is a deficient number, since it is larger than the sum of its proper divisors (8228317).

99211811 is a wasteful number, since it uses less digits than its factorization.

99211811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802.

The product of its digits is 1296, while the sum is 32.

The square root of 99211811 is about 9960.5125872116. The cubic root of 99211811 is about 462.9361822267.

The spelling of 99211811 in words is "ninety-nine million, two hundred eleven thousand, eight hundred eleven".