7530421 has 2 divisors, whose sum is σ = 7530422. Its totient is φ = 7530420.

The previous prime is 7530377. The next prime is 7530431. The reversal of 7530421 is 1240357.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5827396 + 1703025 = 2414^2 + 1305^2 .

It is a cyclic number.

It is not a de Polignac number, because 7530421 - 2¹⁹ = 7006133 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 7530392 and 7530401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7530431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3765210 + 3765211.

It is an arithmetic number, because the mean of its divisors is an integer number (3765211).

Almost surely, 2^7530421 is an apocalyptic number.

It is an amenable number.

7530421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7530421 is an equidigital number, since it uses as much as digits as its factorization.

7530421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 7530421 is about 2744.1612561947. The cubic root of 7530421 is about 196.0076787912.

Adding to 7530421 its reverse (1240357), we get a palindrome (8770778).

Subtracting from 7530421 its reverse (1240357), we obtain a square (6290064 = 2508²).

The spelling of 7530421 in words is "seven million, five hundred thirty thousand, four hundred twenty-one".