7243421 has 2 divisors, whose sum is σ = 7243422. Its totient is φ = 7243420.

The previous prime is 7243409. The next prime is 7243441. The reversal of 7243421 is 1243427.

7243421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4305625 + 2937796 = 2075^2 + 1714^2 .

It is an emirp because it is prime and its reverse (1243427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7243421 - 2¹⁸ = 6981277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7243441) 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 as a sum of consecutive naturals, namely, 3621710 + 3621711.

It is an arithmetic number, because the mean of its divisors is an integer number (3621711).

Almost surely, 2^7243421 is an apocalyptic number.

It is an amenable number.

7243421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7243421 is an equidigital number, since it uses as much as digits as its factorization.

7243421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 23.

The square root of 7243421 is about 2691.3604366565. The cubic root of 7243421 is about 193.4852706418.

Adding to 7243421 its reverse (1243427), we get a palindrome (8486848).

The spelling of 7243421 in words is "seven million, two hundred forty-three thousand, four hundred twenty-one".