12678421 has 16 divisors (see below), whose sum is σ = 15055744. Its totient is φ = 10450944.

The previous prime is 12678371. The next prime is 12678427. The reversal of 12678421 is 12487621.

It is not a de Polignac number, because 12678421 - 2⁹ = 12677909 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 (12678427) 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 15 ways as a sum of consecutive naturals, for example, 21685 + ... + 22261.

It is an arithmetic number, because the mean of its divisors is an integer number (940984).

Almost surely, 2^12678421 is an apocalyptic number.

It is an amenable number.

12678421 is a deficient number, since it is larger than the sum of its proper divisors (2377323).

12678421 is an equidigital number, since it uses as much as digits as its factorization.

12678421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700.

The product of its digits is 5376, while the sum is 31.

The square root of 12678421 is about 3560.6770423615. The cubic root of 12678421 is about 233.1784384679.

The spelling of 12678421 in words is "twelve million, six hundred seventy-eight thousand, four hundred twenty-one".