65530221 has 16 divisors (see below), whose sum is σ = 93350400. Its totient is φ = 40767408.

The previous prime is 65530211. The next prime is 65530247. The reversal of 65530221 is 12203556.

It is not a de Polignac number, because 65530221 - 2⁷ = 65530093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65530191 and 65530200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65530211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4761 + ... + 12398.

It is an arithmetic number, because the mean of its divisors is an integer number (5834400).

Almost surely, 2^65530221 is an apocalyptic number.

It is an amenable number.

65530221 is a deficient number, since it is larger than the sum of its proper divisors (27820179).

65530221 is a wasteful number, since it uses less digits than its factorization.

65530221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17248.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 65530221 is about 8095.0738724239. The cubic root of 65530221 is about 403.1628848958.

Adding to 65530221 its reverse (12203556), we get a palindrome (77733777).

It can be divided in two parts, 655 and 30221, that added together give a triangular number (30876 = T₂₄₈).

The spelling of 65530221 in words is "sixty-five million, five hundred thirty thousand, two hundred twenty-one".