12421287 has 12 divisors (see below), whose sum is σ = 18037344. Its totient is φ = 8236800.

The previous prime is 12421267. The next prime is 12421291. The reversal of 12421287 is 78212421.

It is not a de Polignac number, because 12421287 - 2⁶ = 12421223 is a prime.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 12421287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12421217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1839 + ... + 5312.

It is an arithmetic number, because the mean of its divisors is an integer number (1503112).

Almost surely, 2^12421287 is an apocalyptic number.

12421287 is a deficient number, since it is larger than the sum of its proper divisors (5616057).

12421287 is a wasteful number, since it uses less digits than its factorization.

12421287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7350 (or 7347 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 12421287 is about 3524.3846271371. The cubic root of 12421287 is about 231.5912777371.

The spelling of 12421287 in words is "twelve million, four hundred twenty-one thousand, two hundred eighty-seven".