123421142423 has 4 divisors (see below), whose sum is σ = 123425627520. Its totient is φ = 123416657328.

The previous prime is 123421142399. The next prime is 123421142441. The reversal of 123421142423 is 324241124321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 324241124321 = 17 ⋅19073007313.

It is a cyclic number.

It is not a de Polignac number, because 123421142423 - 2⁶ = 123421142359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123421142473) 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, 2201015 + ... + 2256392.

It is an arithmetic number, because the mean of its divisors is an integer number (30856406880).

Almost surely, 2^123421142423 is an apocalyptic number.

123421142423 is a deficient number, since it is larger than the sum of its proper divisors (4485097).

123421142423 is an equidigital number, since it uses as much as digits as its factorization.

123421142423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4485096.

The product of its digits is 9216, while the sum is 29.

Adding to 123421142423 its reverse (324241124321), we get a palindrome (447662266744).

The spelling of 123421142423 in words is "one hundred twenty-three billion, four hundred twenty-one million, one hundred forty-two thousand, four hundred twenty-three".