65212321 has 4 divisors (see below), whose sum is σ = 65234944. Its totient is φ = 65189700.

The previous prime is 65212307. The next prime is 65212361. The reversal of 65212321 is 12321256.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65212321 - 2¹¹ = 65210273 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65212292 and 65212301.

It is not an unprimeable number, because it can be changed into a prime (65212361) 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, 6225 + ... + 13006.

It is an arithmetic number, because the mean of its divisors is an integer number (16308736).

Almost surely, 2^65212321 is an apocalyptic number.

It is an amenable number.

65212321 is a deficient number, since it is larger than the sum of its proper divisors (22623).

65212321 is a wasteful number, since it uses less digits than its factorization.

65212321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22622.

The product of its digits is 720, while the sum is 22.

The square root of 65212321 is about 8075.4146023594. The cubic root of 65212321 is about 402.5098869786.

Adding to 65212321 its reverse (12321256), we get a palindrome (77533577).

The spelling of 65212321 in words is "sixty-five million, two hundred twelve thousand, three hundred twenty-one".