12563421 has 8 divisors (see below), whose sum is σ = 18039840. Its totient is φ = 7731312.

The previous prime is 12563417. The next prime is 12563437. The reversal of 12563421 is 12436521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12563421 - 2² = 12563417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12563391 and 12563400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12563321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161031 + ... + 161108.

It is an arithmetic number, because the mean of its divisors is an integer number (2254980).

Almost surely, 2^12563421 is an apocalyptic number.

It is an amenable number.

12563421 is a deficient number, since it is larger than the sum of its proper divisors (5476419).

12563421 is a wasteful number, since it uses less digits than its factorization.

12563421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322155.

The product of its digits is 1440, while the sum is 24.

The square root of 12563421 is about 3544.4916419707. The cubic root of 12563421 is about 232.4712786813.

Adding to 12563421 its reverse (12436521), we get a palindrome (24999942).

It can be divided in two parts, 125 and 63421, that added together give a triangular number (63546 = T₃₅₆).

The spelling of 12563421 in words is "twelve million, five hundred sixty-three thousand, four hundred twenty-one".