7455221 has 4 divisors (see below), whose sum is σ = 7695744. Its totient is φ = 7214700.

The previous prime is 7455193. The next prime is 7455223. The reversal of 7455221 is 1225547.

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: 1225547 = 17 ⋅72091.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7455221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7455223) 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, 120215 + ... + 120276.

It is an arithmetic number, because the mean of its divisors is an integer number (1923936).

Almost surely, 2^7455221 is an apocalyptic number.

It is an amenable number.

7455221 is a deficient number, since it is larger than the sum of its proper divisors (240523).

7455221 is a wasteful number, since it uses less digits than its factorization.

7455221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240522.

The product of its digits is 2800, while the sum is 26.

The square root of 7455221 is about 2730.4250584845. The cubic root of 7455221 is about 195.3530400455.

The spelling of 7455221 in words is "seven million, four hundred fifty-five thousand, two hundred twenty-one".