12123231443 has 4 divisors (see below), whose sum is σ = 12124495968. Its totient is φ = 12121966920.

The previous prime is 12123231383. The next prime is 12123231457. The reversal of 12123231443 is 34413232121.

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 12123231443 - 2²⁶ = 12056122579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12123231343) 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, 617771 + ... + 637092.

It is an arithmetic number, because the mean of its divisors is an integer number (3031123992).

Almost surely, 2^12123231443 is an apocalyptic number.

12123231443 is a deficient number, since it is larger than the sum of its proper divisors (1264525).

12123231443 is an equidigital number, since it uses as much as digits as its factorization.

12123231443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264524.

The product of its digits is 3456, while the sum is 26.

Adding to 12123231443 its reverse (34413232121), we get a palindrome (46536463564).

The spelling of 12123231443 in words is "twelve billion, one hundred twenty-three million, two hundred thirty-one thousand, four hundred forty-three".