12855421 has 4 divisors (see below), whose sum is σ = 13270144. Its totient is φ = 12440700.

The previous prime is 12855407. The next prime is 12855449. The reversal of 12855421 is 12455821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12455821 = 7 ⋅1779403.

It is a cyclic number.

It is not a de Polignac number, because 12855421 - 2⁵ = 12855389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12855421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12855481) 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, 207315 + ... + 207376.

It is an arithmetic number, because the mean of its divisors is an integer number (3317536).

Almost surely, 2^12855421 is an apocalyptic number.

It is an amenable number.

12855421 is a deficient number, since it is larger than the sum of its proper divisors (414723).

12855421 is an equidigital number, since it uses as much as digits as its factorization.

12855421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414722.

The product of its digits is 3200, while the sum is 28.

The square root of 12855421 is about 3585.4457184568. The cubic root of 12855421 is about 234.2585412772.

The spelling of 12855421 in words is "twelve million, eight hundred fifty-five thousand, four hundred twenty-one".