6553421 has 4 divisors (see below), whose sum is σ = 7489632. Its totient is φ = 5617212.

The previous prime is 6553387. The next prime is 6553441. The reversal of 6553421 is 1243556.

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 a cyclic number.

It is not a de Polignac number, because 6553421 - 2⁶ = 6553357 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 (6553441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 468095 + ... + 468108.

It is an arithmetic number, because the mean of its divisors is an integer number (1872408).

Almost surely, 2^6553421 is an apocalyptic number.

It is an amenable number.

6553421 is a deficient number, since it is larger than the sum of its proper divisors (936211).

6553421 is an equidigital number, since it uses as much as digits as its factorization.

6553421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936210.

The product of its digits is 3600, while the sum is 26.

The square root of 6553421 is about 2559.9650388238. The cubic root of 6553421 is about 187.1354314568.

Adding to 6553421 its reverse (1243556), we get a palindrome (7796977).

The spelling of 6553421 in words is "six million, five hundred fifty-three thousand, four hundred twenty-one".