12309621 has 8 divisors (see below), whose sum is σ = 16722720. Its totient is φ = 8051472.

The previous prime is 12309613. The next prime is 12309631. The reversal of 12309621 is 12690321.

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

It is not a de Polignac number, because 12309621 - 2³ = 12309613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12309591 and 12309600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12309631) 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, 38551 + ... + 38868.

It is an arithmetic number, because the mean of its divisors is an integer number (2090340).

Almost surely, 2^12309621 is an apocalyptic number.

It is an amenable number.

12309621 is a deficient number, since it is larger than the sum of its proper divisors (4413099).

12309621 is an equidigital number, since it uses as much as digits as its factorization.

12309621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77475.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 12309621 is about 3508.5069474065. The cubic root of 12309621 is about 230.8951942997.

Adding to 12309621 its reverse (12690321), we get a palindrome (24999942).

The spelling of 12309621 in words is "twelve million, three hundred nine thousand, six hundred twenty-one".