12421509 has 12 divisors (see below), whose sum is σ = 17594784. Its totient is φ = 7793344.

The previous prime is 12421501. The next prime is 12421517. The reversal of 12421509 is 90512421.

12421509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12421501) and next prime (12421517).

It is not a de Polignac number, because 12421509 - 2³ = 12421501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12421501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6297 + ... + 8030.

It is an arithmetic number, because the mean of its divisors is an integer number (1466232).

Almost surely, 2^12421509 is an apocalyptic number.

It is an amenable number.

12421509 is a deficient number, since it is larger than the sum of its proper divisors (5173275).

12421509 is a wasteful number, since it uses less digits than its factorization.

12421509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14364 (or 14347 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 12421509 is about 3524.4161218562. The cubic root of 12421509 is about 231.5926574374.

The spelling of 12421509 in words is "twelve million, four hundred twenty-one thousand, five hundred nine".