12345421 has 8 divisors (see below), whose sum is σ = 14176800. Its totient is φ = 10632240.

The previous prime is 12345419. The next prime is 12345427. The reversal of 12345421 is 12454321.

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

It is a cyclic number.

It is not a de Polignac number, because 12345421 - 2¹ = 12345419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12345392 and 12345401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12345427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29326 + ... + 29743.

It is an arithmetic number, because the mean of its divisors is an integer number (1772100).

Almost surely, 2^12345421 is an apocalyptic number.

12345421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12345421 is a deficient number, since it is larger than the sum of its proper divisors (1831379).

12345421 is a wasteful number, since it uses less digits than its factorization.

12345421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59099.

The product of its digits is 960, while the sum is 22.

The square root of 12345421 is about 3513.6051286392. The cubic root of 12345421 is about 231.1188147104.

Adding to 12345421 its reverse (12454321), we get a palindrome (24799742).

Subtracting 12345421 from its reverse (12454321), we obtain a square (108900 = 330²).

The spelling of 12345421 in words is "twelve million, three hundred forty-five thousand, four hundred twenty-one".