12423421 has 4 divisors (see below), whose sum is σ = 12563100. Its totient is φ = 12283744.

The previous prime is 12423409. The next prime is 12423457. The reversal of 12423421 is 12432421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12432421 = 59 ⋅210719.

It can be written as a sum of positive squares in 2 ways, for example, as 6687396 + 5736025 = 2586^2 + 2395^2 .

It is a cyclic number.

It is not a de Polignac number, because 12423421 - 2¹³ = 12415229 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 (12423401) 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, 69706 + ... + 69883.

It is an arithmetic number, because the mean of its divisors is an integer number (3140775).

Almost surely, 2^12423421 is an apocalyptic number.

It is an amenable number.

12423421 is a deficient number, since it is larger than the sum of its proper divisors (139679).

12423421 is an equidigital number, since it uses as much as digits as its factorization.

12423421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139678.

The product of its digits is 384, while the sum is 19.

The square root of 12423421 is about 3524.6873620223. The cubic root of 12423421 is about 231.6045395805.

Adding to 12423421 its reverse (12432421), we get a palindrome (24855842).

The spelling of 12423421 in words is "twelve million, four hundred twenty-three thousand, four hundred twenty-one".