11123321999 has 4 divisors (see below), whose sum is σ = 11123703600. Its totient is φ = 11122940400.

The previous prime is 11123321987. The next prime is 11123322029. The reversal of 11123321999 is 99912332111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99912332111 = 101 ⋅989231011.

It is a cyclic number.

It is not a de Polignac number, because 11123321999 - 2¹² = 11123317903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11123321299) 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, 143102 + ... + 206699.

It is an arithmetic number, because the mean of its divisors is an integer number (2780925900).

Almost surely, 2^11123321999 is an apocalyptic number.

11123321999 is a deficient number, since it is larger than the sum of its proper divisors (381601).

11123321999 is an equidigital number, since it uses as much as digits as its factorization.

11123321999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381600.

The product of its digits is 26244, while the sum is 41.

The spelling of 11123321999 in words is "eleven billion, one hundred twenty-three million, three hundred twenty-one thousand, nine hundred ninety-nine".