6530421 has 4 divisors (see below), whose sum is σ = 8707232. Its totient is φ = 4353612.

The previous prime is 6530417. The next prime is 6530437. The reversal of 6530421 is 1240356.

It is a happy number.

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.

It is not a de Polignac number, because 6530421 - 2² = 6530417 is a prime.

It is a D-number.

It is a Duffinian number.

6530421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6530401) 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, 1088401 + ... + 1088406.

It is an arithmetic number, because the mean of its divisors is an integer number (2176808).

Almost surely, 2^6530421 is an apocalyptic number.

It is an amenable number.

6530421 is a deficient number, since it is larger than the sum of its proper divisors (2176811).

6530421 is a wasteful number, since it uses less digits than its factorization.

6530421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2176810.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 6530421 is about 2555.4688415240. The cubic root of 6530421 is about 186.9162502571.

Adding to 6530421 its reverse (1240356), we get a palindrome (7770777).

The spelling of 6530421 in words is "six million, five hundred thirty thousand, four hundred twenty-one".