221247265 has 8 divisors (see below), whose sum is σ = 281114280. Its totient is φ = 166586112.

The previous prime is 221247263. The next prime is 221247307. The reversal of 221247265 is 562742122.

It can be written as a sum of positive squares in 4 ways, for example, as 30558784 + 190688481 = 5528^2 + 13809^2 .

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 221247265 - 2¹ = 221247263 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221247263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1301370 + ... + 1301539.

It is an arithmetic number, because the mean of its divisors is an integer number (35139285).

Almost surely, 2^221247265 is an apocalyptic number.

It is an amenable number.

221247265 is a deficient number, since it is larger than the sum of its proper divisors (59867015).

221247265 is a wasteful number, since it uses less digits than its factorization.

221247265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2602931.

The product of its digits is 13440, while the sum is 31.

The square root of 221247265 is about 14874.3828443401. The cubic root of 221247265 is about 604.8197582513.

Adding to 221247265 its reverse (562742122), we get a palindrome (783989387).

The spelling of 221247265 in words is "two hundred twenty-one million, two hundred forty-seven thousand, two hundred sixty-five".