221530265 has 8 divisors (see below), whose sum is σ = 290003328. Its totient is φ = 161112880.

The previous prime is 221530229. The next prime is 221530271. The reversal of 221530265 is 562035122.

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

It is not a de Polignac number, because 221530265 - 2⁶ = 221530201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2013857 + ... + 2013966.

It is an arithmetic number, because the mean of its divisors is an integer number (36250416).

Almost surely, 2^221530265 is an apocalyptic number.

It is an amenable number.

221530265 is a deficient number, since it is larger than the sum of its proper divisors (68473063).

221530265 is a wasteful number, since it uses less digits than its factorization.

221530265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4027839.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 221530265 is about 14883.8928039677. The cubic root of 221530265 is about 605.0775257527.

Adding to 221530265 its reverse (562035122), we get a palindrome (783565387).

The spelling of 221530265 in words is "two hundred twenty-one million, five hundred thirty thousand, two hundred sixty-five".