7255221 has 4 divisors (see below), whose sum is σ = 9673632. Its totient is φ = 4836812.

The previous prime is 7255211. The next prime is 7255231. The reversal of 7255221 is 1225527.

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 an interprime number because it is at equal distance from previous prime (7255211) and next prime (7255231).

It is a cyclic number.

It is not a de Polignac number, because 7255221 - 2¹¹ = 7253173 is a prime.

7255221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 7255191 and 7255200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7255201) 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, 1209201 + ... + 1209206.

It is an arithmetic number, because the mean of its divisors is an integer number (2418408).

Almost surely, 2^7255221 is an apocalyptic number.

It is an amenable number.

7255221 is a deficient number, since it is larger than the sum of its proper divisors (2418411).

7255221 is a wasteful number, since it uses less digits than its factorization.

7255221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2418410.

The product of its digits is 1400, while the sum is 24.

The square root of 7255221 is about 2693.5517444445. The cubic root of 7255221 is about 193.5902803017.

The spelling of 7255221 in words is "seven million, two hundred fifty-five thousand, two hundred twenty-one".