12340621 has 4 divisors (see below), whose sum is σ = 12348544. Its totient is φ = 12332700.

The previous prime is 12340607. The next prime is 12340637. The reversal of 12340621 is 12604321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12604321 = 31 ⋅406591.

It is a cyclic number.

It is not a de Polignac number, because 12340621 - 2¹⁵ = 12307853 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 (12340661) 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 3 ways as a sum of consecutive naturals, for example, 765 + ... + 5026.

It is an arithmetic number, because the mean of its divisors is an integer number (3087136).

Almost surely, 2^12340621 is an apocalyptic number.

It is an amenable number.

12340621 is a deficient number, since it is larger than the sum of its proper divisors (7923).

12340621 is an equidigital number, since it uses as much as digits as its factorization.

12340621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7922.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 12340621 is about 3512.9220031193. The cubic root of 12340621 is about 231.0888572031.

Adding to 12340621 its reverse (12604321), we get a palindrome (24944942).

The spelling of 12340621 in words is "twelve million, three hundred forty thousand, six hundred twenty-one".