123444142321 has 4 divisors (see below), whose sum is σ = 123574496112. Its totient is φ = 123313788532.

The previous prime is 123444142259. The next prime is 123444142343. The reversal of 123444142321 is 123241444321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 123241444321 = 6121 ⋅20134201.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123444142321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123444142361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65175475 + ... + 65177368.

It is an arithmetic number, because the mean of its divisors is an integer number (30893624028).

Almost surely, 2^123444142321 is an apocalyptic number.

It is an amenable number.

123444142321 is a deficient number, since it is larger than the sum of its proper divisors (130353791).

123444142321 is an equidigital number, since it uses as much as digits as its factorization.

123444142321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130353790.

The product of its digits is 18432, while the sum is 31.

Adding to 123444142321 its reverse (123241444321), we get a palindrome (246685586642).

The spelling of 123444142321 in words is "one hundred twenty-three billion, four hundred forty-four million, one hundred forty-two thousand, three hundred twenty-one".