65204221 has 2 divisors, whose sum is σ = 65204222. Its totient is φ = 65204220.

The previous prime is 65204207. The next prime is 65204233. The reversal of 65204221 is 12240256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63776196 + 1428025 = 7986^2 + 1195^2 .

It is a cyclic number.

It is not a de Polignac number, because 65204221 - 2⁵ = 65204189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65204192 and 65204201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65204201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32602110 + 32602111.

It is an arithmetic number, because the mean of its divisors is an integer number (32602111).

Almost surely, 2^65204221 is an apocalyptic number.

It is an amenable number.

65204221 is a deficient number, since it is larger than the sum of its proper divisors (1).

65204221 is an equidigital number, since it uses as much as digits as its factorization.

65204221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 65204221 is about 8074.9130645475. The cubic root of 65204221 is about 402.4932210836.

Adding to 65204221 its reverse (12240256), we get a palindrome (77444477).

The spelling of 65204221 in words is "sixty-five million, two hundred four thousand, two hundred twenty-one".