7245221 has 8 divisors (see below), whose sum is σ = 7395864. Its totient is φ = 7096320.

The previous prime is 7245209. The next prime is 7245239. The reversal of 7245221 is 1225427.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 280900 + 6964321 = 530^2 + 2639^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7245221 - 2¹⁸ = 6983077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7245241) 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 7 ways as a sum of consecutive naturals, for example, 10631 + ... + 11291.

It is an arithmetic number, because the mean of its divisors is an integer number (924483).

Almost surely, 2^7245221 is an apocalyptic number.

It is an amenable number.

7245221 is a deficient number, since it is larger than the sum of its proper divisors (150643).

7245221 is a wasteful number, since it uses less digits than its factorization.

7245221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871.

The product of its digits is 1120, while the sum is 23.

The square root of 7245221 is about 2691.6948192542. The cubic root of 7245221 is about 193.5012964323.

The spelling of 7245221 in words is "seven million, two hundred forty-five thousand, two hundred twenty-one".