12030311231 has 4 divisors (see below), whose sum is σ = 12032669232. Its totient is φ = 12027953232.

The previous prime is 12030311179. The next prime is 12030311257. The reversal of 12030311231 is 13211303021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12030311231 is a prime.

It is a super-2 number, since 2×12030311231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12030311281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1171331 + ... + 1181556.

It is an arithmetic number, because the mean of its divisors is an integer number (3008167308).

Almost surely, 2^12030311231 is an apocalyptic number.

12030311231 is a deficient number, since it is larger than the sum of its proper divisors (2358001).

12030311231 is an equidigital number, since it uses as much as digits as its factorization.

12030311231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2358000.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 12030311231 its reverse (13211303021), we get a palindrome (25241614252).

The spelling of 12030311231 in words is "twelve billion, thirty million, three hundred eleven thousand, two hundred thirty-one".