7421321 has 4 divisors (see below), whose sum is σ = 7543044. Its totient is φ = 7299600.

The previous prime is 7421263. The next prime is 7421329. The reversal of 7421321 is 1231247.

7421321 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2062096 + 5359225 = 1436^2 + 2315^2 .

It is a cyclic number.

It is not a de Polignac number, because 7421321 - 2⁶ = 7421257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7421293 and 7421302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7421329) 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, 60770 + ... + 60891.

It is an arithmetic number, because the mean of its divisors is an integer number (1885761).

Almost surely, 2^7421321 is an apocalyptic number.

It is an amenable number.

7421321 is a deficient number, since it is larger than the sum of its proper divisors (121723).

7421321 is a wasteful number, since it uses less digits than its factorization.

7421321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121722.

The product of its digits is 336, while the sum is 20.

The square root of 7421321 is about 2724.2101607622. The cubic root of 7421321 is about 195.0564903177.

Adding to 7421321 its reverse (1231247), we get a palindrome (8652568).

The spelling of 7421321 in words is "seven million, four hundred twenty-one thousand, three hundred twenty-one".