12340421 has 2 divisors, whose sum is σ = 12340422. Its totient is φ = 12340420.

The previous prime is 12340411. The next prime is 12340423. The reversal of 12340421 is 12404321.

12340421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9150625 + 3189796 = 3025^2 + 1786^2 .

It is a cyclic number.

It is not a de Polignac number, because 12340421 - 2¹⁸ = 12078277 is a prime.

Together with 12340423, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12340421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12340423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6170210 + 6170211.

It is an arithmetic number, because the mean of its divisors is an integer number (6170211).

Almost surely, 2^12340421 is an apocalyptic number.

It is an amenable number.

12340421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12340421 is an equidigital number, since it uses as much as digits as its factorization.

12340421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 12340421 is about 3512.8935366732. The cubic root of 12340421 is about 231.0876088051.

Adding to 12340421 its reverse (12404321), we get a palindrome (24744742).

The spelling of 12340421 in words is "twelve million, three hundred forty thousand, four hundred twenty-one".