11821099 has 4 divisors (see below), whose sum is σ = 11943064. Its totient is φ = 11699136.

The previous prime is 11821081. The next prime is 11821123. The reversal of 11821099 is 99012811.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11821099 - 2⁷ = 11820971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11821099.

It is not an unprimeable number, because it can be changed into a prime (11821399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60837 + ... + 61030.

It is an arithmetic number, because the mean of its divisors is an integer number (2985766).

Almost surely, 2^11821099 is an apocalyptic number.

11821099 is a deficient number, since it is larger than the sum of its proper divisors (121965).

11821099 is an equidigital number, since it uses as much as digits as its factorization.

11821099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121964.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 11821099 is about 3438.1825140618. The cubic root of 11821099 is about 227.7994221924.

The spelling of 11821099 in words is "eleven million, eight hundred twenty-one thousand, ninety-nine".