11981822099 has 4 divisors (see below), whose sum is σ = 12903500736. Its totient is φ = 11060143464.

The previous prime is 11981822089. The next prime is 11981822113. The reversal of 11981822099 is 99022818911.

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 11981822099 - 2⁸ = 11981821843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11981822089) 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, 460839299 + ... + 460839324.

It is an arithmetic number, because the mean of its divisors is an integer number (3225875184).

Almost surely, 2^11981822099 is an apocalyptic number.

11981822099 is a deficient number, since it is larger than the sum of its proper divisors (921678637).

11981822099 is an equidigital number, since it uses as much as digits as its factorization.

11981822099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921678636.

The product of its (nonzero) digits is 186624, while the sum is 50.

The spelling of 11981822099 in words is "eleven billion, nine hundred eighty-one million, eight hundred twenty-two thousand, ninety-nine".