12644222203 has 4 divisors (see below), whose sum is σ = 12644974408. Its totient is φ = 12643470000.

The previous prime is 12644222189. The next prime is 12644222231. The reversal of 12644222203 is 30222244621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30222244621 = 1993 ⋅15164197.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12644222203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12644222233) 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, 350298 + ... + 384703.

It is an arithmetic number, because the mean of its divisors is an integer number (3161243602).

Almost surely, 2^12644222203 is an apocalyptic number.

12644222203 is a deficient number, since it is larger than the sum of its proper divisors (752205).

12644222203 is an equidigital number, since it uses as much as digits as its factorization.

12644222203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752204.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 12644222203 its reverse (30222244621), we get a palindrome (42866466824).

The spelling of 12644222203 in words is "twelve billion, six hundred forty-four million, two hundred twenty-two thousand, two hundred three".