7224421 has 4 divisors (see below), whose sum is σ = 7277292. Its totient is φ = 7171552.

The previous prime is 7224419. The next prime is 7224431. The reversal of 7224421 is 1244227.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1244227 = 41 ⋅30347.

It can be written as a sum of positive squares in 2 ways, for example, as 2873025 + 4351396 = 1695^2 + 2086^2 .

It is a cyclic number.

It is not a de Polignac number, because 7224421 - 2¹ = 7224419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7224392 and 7224401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7224401) 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, 26230 + ... + 26503.

It is an arithmetic number, because the mean of its divisors is an integer number (1819323).

Almost surely, 2^7224421 is an apocalyptic number.

It is an amenable number.

7224421 is a deficient number, since it is larger than the sum of its proper divisors (52871).

7224421 is a wasteful number, since it uses less digits than its factorization.

7224421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52870.

The product of its digits is 896, while the sum is 22.

The square root of 7224421 is about 2687.8283055285. The cubic root of 7224421 is about 193.3159473730.

Adding to 7224421 its reverse (1244227), we get a palindrome (8468648).

The spelling of 7224421 in words is "seven million, two hundred twenty-four thousand, four hundred twenty-one".