12111321203 has 4 divisors (see below), whose sum is σ = 12823751880. Its totient is φ = 11398890528.

The previous prime is 12111321199. The next prime is 12111321217. The reversal of 12111321203 is 30212311121.

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 12111321203 - 2² = 12111321199 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 712430659 = 12111321203 / (1 + 2 + 1 + 1 + 1 + 3 + 2 + 1 + 2 + 0 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12111321223) 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, 356215313 + ... + 356215346.

It is an arithmetic number, because the mean of its divisors is an integer number (3205937970).

Almost surely, 2^12111321203 is an apocalyptic number.

12111321203 is a deficient number, since it is larger than the sum of its proper divisors (712430677).

12111321203 is an equidigital number, since it uses as much as digits as its factorization.

12111321203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712430676.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 12111321203 its reverse (30212311121), we get a palindrome (42323632324).

The spelling of 12111321203 in words is "twelve billion, one hundred eleven million, three hundred twenty-one thousand, two hundred three".