12011111993 has 4 divisors (see below), whose sum is σ = 12018012708. Its totient is φ = 12004211280.

The previous prime is 12011111977. The next prime is 12011112007. The reversal of 12011111993 is 39911111021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39911111021 = 17 ⋅2347712413.

It can be written as a sum of positive squares in 2 ways, for example, as 215414329 + 11795697664 = 14677^2 + 108608^2 .

It is a cyclic number.

It is not a de Polignac number, because 12011111993 - 2⁴ = 12011111977 is a prime.

It is a super-2 number, since 2×12011111993² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12011111923) 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, 3447746 + ... + 3451227.

It is an arithmetic number, because the mean of its divisors is an integer number (3004503177).

Almost surely, 2^12011111993 is an apocalyptic number.

It is an amenable number.

12011111993 is a deficient number, since it is larger than the sum of its proper divisors (6900715).

12011111993 is an equidigital number, since it uses as much as digits as its factorization.

12011111993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6900714.

The product of its (nonzero) digits is 486, while the sum is 29.

The spelling of 12011111993 in words is "twelve billion, eleven million, one hundred eleven thousand, nine hundred ninety-three".