7533421 has 4 divisors (see below), whose sum is σ = 8609632. Its totient is φ = 6457212.

The previous prime is 7533391. The next prime is 7533433. The reversal of 7533421 is 1243357.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1243357 = 23 ⋅54059.

It is a cyclic number.

It is not a de Polignac number, because 7533421 - 2⁵ = 7533389 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 (7533451) 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, 538095 + ... + 538108.

It is an arithmetic number, because the mean of its divisors is an integer number (2152408).

Almost surely, 2^7533421 is an apocalyptic number.

It is an amenable number.

7533421 is a deficient number, since it is larger than the sum of its proper divisors (1076211).

7533421 is a wasteful number, since it uses less digits than its factorization.

7533421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076210.

The product of its digits is 2520, while the sum is 25.

The square root of 7533421 is about 2744.7078168723. The cubic root of 7533421 is about 196.0337041165.

Adding to 7533421 its reverse (1243357), we get a palindrome (8776778).

Subtracting from 7533421 its reverse (1243357), we obtain a square (6290064 = 2508²).

The spelling of 7533421 in words is "seven million, five hundred thirty-three thousand, four hundred twenty-one".