12421309 has 8 divisors (see below), whose sum is σ = 12972960. Its totient is φ = 11877936.

The previous prime is 12421291. The next prime is 12421327. The reversal of 12421309 is 90312421.

It is an interprime number because it is at equal distance from previous prime (12421291) and next prime (12421327).

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

It is not a de Polignac number, because 12421309 - 2²¹ = 10324157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12421309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12421349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1102 + ... + 5104.

It is an arithmetic number, because the mean of its divisors is an integer number (1621620).

Almost surely, 2^12421309 is an apocalyptic number.

It is an amenable number.

12421309 is a deficient number, since it is larger than the sum of its proper divisors (551651).

12421309 is a wasteful number, since it uses less digits than its factorization.

12421309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4139.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 12421309 is about 3524.3877482479. The cubic root of 12421309 is about 231.5914144649.

The spelling of 12421309 in words is "twelve million, four hundred twenty-one thousand, three hundred nine".