12678221 has 8 divisors (see below), whose sum is σ = 13317504. Its totient is φ = 12046320.

The previous prime is 12678199. The next prime is 12678223. The reversal of 12678221 is 12287621.

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 12678221 - 2¹⁴ = 12661837 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 (12678223) 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, 1856 + ... + 5366.

It is an arithmetic number, because the mean of its divisors is an integer number (1664688).

Almost surely, 2^12678221 is an apocalyptic number.

It is an amenable number.

12678221 is a deficient number, since it is larger than the sum of its proper divisors (639283).

12678221 is a wasteful number, since it uses less digits than its factorization.

12678221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3691.

The product of its digits is 2688, while the sum is 29.

The square root of 12678221 is about 3560.6489577042. The cubic root of 12678221 is about 233.1772123444.

The spelling of 12678221 in words is "twelve million, six hundred seventy-eight thousand, two hundred twenty-one".