65005421 has 8 divisors (see below), whose sum is σ = 70221984. Its totient is φ = 59819760.

The previous prime is 65005363. The next prime is 65005427. The reversal of 65005421 is 12450056.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65005421 - 2¹⁴ = 64989037 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 (65005427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3251 + ... + 11856.

It is an arithmetic number, because the mean of its divisors is an integer number (8777748).

Almost surely, 2^65005421 is an apocalyptic number.

It is an amenable number.

65005421 is a deficient number, since it is larger than the sum of its proper divisors (5216563).

65005421 is a wasteful number, since it uses less digits than its factorization.

65005421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15451.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 65005421 is about 8062.5939374373. The cubic root of 65005421 is about 402.0837531658.

Adding to 65005421 its reverse (12450056), we get a palindrome (77455477).

The spelling of 65005421 in words is "sixty-five million, five thousand, four hundred twenty-one".