65244421 has 4 divisors (see below), whose sum is σ = 71175744. Its totient is φ = 59313100.

The previous prime is 65244409. The next prime is 65244451. The reversal of 65244421 is 12444256.

65244421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 65244421 - 2⁷ = 65244293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65244421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65244401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2965645 + ... + 2965666.

It is an arithmetic number, because the mean of its divisors is an integer number (17793936).

Almost surely, 2^65244421 is an apocalyptic number.

It is an amenable number.

65244421 is a deficient number, since it is larger than the sum of its proper divisors (5931323).

65244421 is a wasteful number, since it uses less digits than its factorization.

65244421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5931322.

The product of its digits is 7680, while the sum is 28.

The square root of 65244421 is about 8077.4018718893. The cubic root of 65244421 is about 402.5759197351.

Adding to 65244421 its reverse (12444256), we get a palindrome (77688677).

The spelling of 65244421 in words is "sixty-five million, two hundred forty-four thousand, four hundred twenty-one".