12111099999 has 16 divisors (see below), whose sum is σ = 17560135008. Its totient is φ = 7393738752.

The previous prime is 12111099971. The next prime is 12111100039. The reversal of 12111099999 is 99999011121.

It is not a de Polignac number, because 12111099999 - 2¹¹ = 12111097951 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111099599) 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, 3207202 + ... + 3210975.

It is an arithmetic number, because the mean of its divisors is an integer number (1097508438).

Almost surely, 2^12111099999 is an apocalyptic number.

12111099999 is a deficient number, since it is larger than the sum of its proper divisors (5449035009).

12111099999 is a wasteful number, since it uses less digits than its factorization.

12111099999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6418234.

The product of its (nonzero) digits is 118098, while the sum is 51.

The spelling of 12111099999 in words is "twelve billion, one hundred eleven million, ninety-nine thousand, nine hundred ninety-nine".