12868421 has 4 divisors (see below), whose sum is σ = 13013100. Its totient is φ = 12723744.

The previous prime is 12868411. The next prime is 12868423. The reversal of 12868421 is 12486821.

It is a happy number.

12868421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12486821 = 541 ⋅23081.

It can be written as a sum of positive squares in 2 ways, for example, as 2208196 + 10660225 = 1486^2 + 3265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12868421 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 (12868423) 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 3 ways as a sum of consecutive naturals, for example, 72206 + ... + 72383.

It is an arithmetic number, because the mean of its divisors is an integer number (3253275).

Almost surely, 2^12868421 is an apocalyptic number.

It is an amenable number.

12868421 is a deficient number, since it is larger than the sum of its proper divisors (144679).

12868421 is an equidigital number, since it uses as much as digits as its factorization.

12868421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144678.

The product of its digits is 6144, while the sum is 32.

The square root of 12868421 is about 3587.2581451577. The cubic root of 12868421 is about 234.3374790544.

The spelling of 12868421 in words is "twelve million, eight hundred sixty-eight thousand, four hundred twenty-one".