221310065 has 8 divisors (see below), whose sum is σ = 266083008. Its totient is φ = 176707440.

The previous prime is 221310031. The next prime is 221310079. The reversal of 221310065 is 560013122.

221310065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-221310065 is a prime.

It is a super-3 number, since 3×221310065³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian 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, 39701 + ... + 44930.

It is an arithmetic number, because the mean of its divisors is an integer number (33260376).

Almost surely, 2^221310065 is an apocalyptic number.

It is an amenable number.

221310065 is a deficient number, since it is larger than the sum of its proper divisors (44772943).

221310065 is an equidigital number, since it uses as much as digits as its factorization.

221310065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85159.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 221310065 is about 14876.4937065157. The cubic root of 221310065 is about 604.8769779231.

Adding to 221310065 its reverse (560013122), we get a palindrome (781323187).

The spelling of 221310065 in words is "two hundred twenty-one million, three hundred ten thousand, sixty-five".