123144444221 has 2 divisors, whose sum is σ = 123144444222. Its totient is φ = 123144444220.

The previous prime is 123144444217. The next prime is 123144444277. The reversal of 123144444221 is 122444441321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105855876025 + 17288568196 = 325355^2 + 131486^2 .

It is a cyclic number.

It is not a de Polignac number, because 123144444221 - 2² = 123144444217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123144444821) 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 as a sum of consecutive naturals, namely, 61572222110 + 61572222111.

It is an arithmetic number, because the mean of its divisors is an integer number (61572222111).

Almost surely, 2^123144444221 is an apocalyptic number.

It is an amenable number.

123144444221 is a deficient number, since it is larger than the sum of its proper divisors (1).

123144444221 is an equidigital number, since it uses as much as digits as its factorization.

123144444221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24576, while the sum is 32.

Adding to 123144444221 its reverse (122444441321), we get a palindrome (245588885542).

The spelling of 123144444221 in words is "one hundred twenty-three billion, one hundred forty-four million, four hundred forty-four thousand, two hundred twenty-one".