221313265 has 8 divisors (see below), whose sum is σ = 265699368. Its totient is φ = 176968320.

The previous prime is 221313263. The next prime is 221313269. The reversal of 221313265 is 562313122.

It can be written as a sum of positive squares in 4 ways, for example, as 404496 + 220908769 = 636^2 + 14863^2 .

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

It is not a de Polignac number, because 221313265 - 2¹ = 221313263 is a prime.

It is a super-2 number, since 2×221313265² = 97959122529920450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221313263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3139 + ... + 21271.

It is an arithmetic number, because the mean of its divisors is an integer number (33212421).

Almost surely, 2^221313265 is an apocalyptic number.

It is an amenable number.

221313265 is a deficient number, since it is larger than the sum of its proper divisors (44386103).

221313265 is a wasteful number, since it uses less digits than its factorization.

221313265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20579.

The product of its digits is 2160, while the sum is 25.

The square root of 221313265 is about 14876.6012583520. The cubic root of 221313265 is about 604.8798932853.

Adding to 221313265 its reverse (562313122), we get a palindrome (783626387).

The spelling of 221313265 in words is "two hundred twenty-one million, three hundred thirteen thousand, two hundred sixty-five".