12421523 has 4 divisors (see below), whose sum is σ = 12537720. Its totient is φ = 12305328.

The previous prime is 12421517. The next prime is 12421537. The reversal of 12421523 is 32512421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12421523 - 2⁸ = 12421267 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12421495 and 12421504.

It is not an unprimeable number, because it can be changed into a prime (12421553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57938 + ... + 58151.

It is an arithmetic number, because the mean of its divisors is an integer number (3134430).

Almost surely, 2^12421523 is an apocalyptic number.

12421523 is a deficient number, since it is larger than the sum of its proper divisors (116197).

12421523 is a wasteful number, since it uses less digits than its factorization.

12421523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116196.

The product of its digits is 480, while the sum is 20.

The square root of 12421523 is about 3524.4181080002. The cubic root of 12421523 is about 231.5927444449.

Adding to 12421523 its reverse (32512421), we get a palindrome (44933944).

The spelling of 12421523 in words is "twelve million, four hundred twenty-one thousand, five hundred twenty-three".