12011111321 has 4 divisors (see below), whose sum is σ = 13103030544. Its totient is φ = 10919192100.

The previous prime is 12011111291. The next prime is 12011111341. The reversal of 12011111321 is 12311111021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12311111021 = 11 ⋅1119191911.

It is a cyclic number.

It is not a de Polignac number, because 12011111321 - 2²² = 12006917017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011111296 and 12011111305.

It is not an unprimeable number, because it can be changed into a prime (12011111341) 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, 545959595 + ... + 545959616.

It is an arithmetic number, because the mean of its divisors is an integer number (3275757636).

Almost surely, 2^12011111321 is an apocalyptic number.

12011111321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12011111321 is a deficient number, since it is larger than the sum of its proper divisors (1091919223).

12011111321 is a wasteful number, since it uses less digits than its factorization.

12011111321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091919222.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 12011111321 its reverse (12311111021), we get a palindrome (24322222342).

The spelling of 12011111321 in words is "twelve billion, eleven million, one hundred eleven thousand, three hundred twenty-one".