12687421 has 8 divisors (see below), whose sum is σ = 13936320. Its totient is φ = 11496672.

The previous prime is 12687379. The next prime is 12687439. The reversal of 12687421 is 12478621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12687421 - 2⁹ = 12686909 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 (12687821) 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, 14080 + ... + 14953.

It is an arithmetic number, because the mean of its divisors is an integer number (1742040).

Almost surely, 2^12687421 is an apocalyptic number.

It is an amenable number.

12687421 is a deficient number, since it is larger than the sum of its proper divisors (1248899).

12687421 is a wasteful number, since it uses less digits than its factorization.

12687421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29075.

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

The square root of 12687421 is about 3561.9406227505. The cubic root of 12687421 is about 233.2336006884.

The spelling of 12687421 in words is "twelve million, six hundred eighty-seven thousand, four hundred twenty-one".