65309421 has 32 divisors (see below), whose sum is σ = 93139200. Its totient is φ = 40642560.

The previous prime is 65309381. The next prime is 65309429. The reversal of 65309421 is 12490356.

It is a de Polignac number, because none of the positive numbers 2^k-65309421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65309429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 599115 + ... + 599223.

It is an arithmetic number, because the mean of its divisors is an integer number (2910600).

Almost surely, 2^65309421 is an apocalyptic number.

It is an amenable number.

65309421 is a deficient number, since it is larger than the sum of its proper divisors (27829779).

65309421 is a wasteful number, since it uses less digits than its factorization.

65309421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 65309421 is about 8081.4244412727. The cubic root of 65309421 is about 402.7095646220.

Adding to 65309421 its reverse (12490356), we get a palindrome (77799777).

It can be divided in two parts, 6530 and 9421, that added together give a palindrome (15951).

The spelling of 65309421 in words is "sixty-five million, three hundred nine thousand, four hundred twenty-one".