65124221 has 2 divisors, whose sum is σ = 65124222. Its totient is φ = 65124220.

The previous prime is 65124197. The next prime is 65124299. The reversal of 65124221 is 12242156.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40819321 + 24304900 = 6389^2 + 4930^2 .

It is a cyclic number.

It is not a de Polignac number, because 65124221 - 2²² = 60929917 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65124721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32562110 + 32562111.

It is an arithmetic number, because the mean of its divisors is an integer number (32562111).

Almost surely, 2^65124221 is an apocalyptic number.

It is an amenable number.

65124221 is a deficient number, since it is larger than the sum of its proper divisors (1).

65124221 is an equidigital number, since it uses as much as digits as its factorization.

65124221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 23.

The square root of 65124221 is about 8069.9579304975. The cubic root of 65124221 is about 402.3285454699.

Adding to 65124221 its reverse (12242156), we get a palindrome (77366377).

The spelling of 65124221 in words is "sixty-five million, one hundred twenty-four thousand, two hundred twenty-one".