65941021 has 2 divisors, whose sum is σ = 65941022. Its totient is φ = 65941020.

The previous prime is 65941009. The next prime is 65941027. The reversal of 65941021 is 12014956.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65772100 + 168921 = 8110^2 + 411^2 .

It is a cyclic number.

It is not a de Polignac number, because 65941021 - 2⁵ = 65940989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65941027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32970510 + 32970511.

It is an arithmetic number, because the mean of its divisors is an integer number (32970511).

Almost surely, 2^65941021 is an apocalyptic number.

It is an amenable number.

65941021 is a deficient number, since it is larger than the sum of its proper divisors (1).

65941021 is an equidigital number, since it uses as much as digits as its factorization.

65941021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 65941021 is about 8120.4076868098. The cubic root of 65941021 is about 404.0035882601.

Adding to 65941021 its reverse (12014956), we get a palindrome (77955977).

The spelling of 65941021 in words is "sixty-five million, nine hundred forty-one thousand, twenty-one".