7253221 has 4 divisors (see below), whose sum is σ = 7449292. Its totient is φ = 7057152.

The previous prime is 7253201. The next prime is 7253261. The reversal of 7253221 is 1223527.

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 6225025 + 1028196 = 2495^2 + 1014^2 .

It is a cyclic number.

It is not a de Polignac number, because 7253221 - 2⁵ = 7253189 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 7253192 and 7253201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7253201) 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, 97980 + ... + 98053.

It is an arithmetic number, because the mean of its divisors is an integer number (1862323).

Almost surely, 2^7253221 is an apocalyptic number.

It is an amenable number.

7253221 is a deficient number, since it is larger than the sum of its proper divisors (196071).

7253221 is a wasteful number, since it uses less digits than its factorization.

7253221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196070.

The product of its digits is 840, while the sum is 22.

The square root of 7253221 is about 2693.1804618332. The cubic root of 7253221 is about 193.5724900721.

Adding to 7253221 its reverse (1223527), we get a palindrome (8476748).

The spelling of 7253221 in words is "seven million, two hundred fifty-three thousand, two hundred twenty-one".