221010065 has 12 divisors (see below), whose sum is σ = 272629404. Its totient is φ = 171872064.

The previous prime is 221010037. The next prime is 221010077. The reversal of 221010065 is 560010122.

It can be written as a sum of positive squares in 6 ways, for example, as 118352641 + 102657424 = 10879^2 + 10132^2 .

It is not a de Polignac number, because 221010065 - 2⁶ = 221010001 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 201659 + ... + 202751.

It is an arithmetic number, because the mean of its divisors is an integer number (22719117).

Almost surely, 2^221010065 is an apocalyptic number.

It is an amenable number.

221010065 is a deficient number, since it is larger than the sum of its proper divisors (51619339).

221010065 is an frugal number, since it uses more digits than its factorization.

221010065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2228 (or 1135 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 221010065 is about 14866.4072660478. The cubic root of 221010065 is about 604.6035378062.

Adding to 221010065 its reverse (560010122), we get a palindrome (781020187).

The spelling of 221010065 in words is "two hundred twenty-one million, ten thousand, sixty-five".