12423455432421 has 16 divisors (see below), whose sum is σ = 18105164877888. Its totient is φ = 7514915158400.

The previous prime is 12423455432369. The next prime is 12423455432441.

12423455432421 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 12423455432421 - 2⁹ = 12423455431909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12423455432441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 361276806 + ... + 361311191.

It is an arithmetic number, because the mean of its divisors is an integer number (1131572804868).

Almost surely, 2^{12423455432421} is an apocalyptic number.

12423455432421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12423455432421 is a deficient number, since it is larger than the sum of its proper divisors (5681709445467).

12423455432421 is a wasteful number, since it uses less digits than its factorization.

12423455432421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722588532.

The product of its digits is 921600, while the sum is 42.

It can be divided in two parts, 1242345 and 5432421, that added together give a palindrome (6674766).

The spelling of 12423455432421 in words is "twelve trillion, four hundred twenty-three billion, four hundred fifty-five million, four hundred thirty-two thousand, four hundred twenty-one".