65320421 has 4 divisors (see below), whose sum is σ = 66913644. Its totient is φ = 63727200.

The previous prime is 65320369. The next prime is 65320427. The reversal of 65320421 is 12402356.

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 35224225 + 30096196 = 5935^2 + 5486^2 .

It is a cyclic number.

It is not a de Polignac number, because 65320421 - 2¹⁴ = 65304037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65320427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 796550 + ... + 796631.

It is an arithmetic number, because the mean of its divisors is an integer number (16728411).

Almost surely, 2^65320421 is an apocalyptic number.

It is an amenable number.

65320421 is a deficient number, since it is larger than the sum of its proper divisors (1593223).

65320421 is a wasteful number, since it uses less digits than its factorization.

65320421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1593222.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 65320421 is about 8082.1049857076. The cubic root of 65320421 is about 402.7321726749.

Adding to 65320421 its reverse (12402356), we get a palindrome (77722777).

The spelling of 65320421 in words is "sixty-five million, three hundred twenty thousand, four hundred twenty-one".