64421 has 4 divisors (see below), whose sum is σ = 73632. Its totient is φ = 55212.

The previous prime is 64403. The next prime is 64433. The reversal of 64421 is 12446.

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 64421 - 2¹⁰ = 63397 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a nialpdrome in base 10 and base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 64421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4595 + ... + 4608.

It is an arithmetic number, because the mean of its divisors is an integer number (18408).

2⁶⁴⁴²¹ is an apocalyptic number.

It is an amenable number.

64421 is a deficient number, since it is larger than the sum of its proper divisors (9211).

64421 is an equidigital number, since it uses as much as digits as its factorization.

64421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9210.

The product of its digits is 192, while the sum is 17.

The square root of 64421 is about 253.8129232328. The cubic root of 64421 is about 40.0875167143.

Adding to 64421 its reverse (12446), we get a palindrome (76867).

The spelling of 64421 in words is "sixty-four thousand, four hundred twenty-one".