102221065 has 4 divisors (see below), whose sum is σ = 122665284. Its totient is φ = 81776848.

The previous prime is 102220997. The next prime is 102221071. The reversal of 102221065 is 560122201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55175184 + 47045881 = 7428^2 + 6859^2 .

It is a cyclic number.

It is not a de Polignac number, because 102221065 - 2⁹ = 102220553 is a prime.

It is a super-2 number, since 2×102221065² = 20898292259468450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10222102 + ... + 10222111.

It is an arithmetic number, because the mean of its divisors is an integer number (30666321).

Almost surely, 2^102221065 is an apocalyptic number.

It is an amenable number.

102221065 is a deficient number, since it is larger than the sum of its proper divisors (20444219).

102221065 is an equidigital number, since it uses as much as digits as its factorization.

102221065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20444218.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 102221065 is about 10110.4433631765. The cubic root of 102221065 is about 467.5701744869.

Adding to 102221065 its reverse (560122201), we get a palindrome (662343266).

The spelling of 102221065 in words is "one hundred two million, two hundred twenty-one thousand, sixty-five".