67320421 has 8 divisors (see below), whose sum is σ = 76990784. Its totient is φ = 57663360.

The previous prime is 67320419. The next prime is 67320443. The reversal of 67320421 is 12402376.

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

It is a cyclic number.

It is not a de Polignac number, because 67320421 - 2¹ = 67320419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67320821) 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 7 ways as a sum of consecutive naturals, for example, 12661 + ... + 17173.

It is an arithmetic number, because the mean of its divisors is an integer number (9623848).

Almost surely, 2^67320421 is an apocalyptic number.

It is an amenable number.

67320421 is a deficient number, since it is larger than the sum of its proper divisors (9670363).

67320421 is a wasteful number, since it uses less digits than its factorization.

67320421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6651.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 67320421 is about 8204.9022541405. The cubic root of 67320421 is about 406.8012459568.

Adding to 67320421 its reverse (12402376), we get a palindrome (79722797).

The spelling of 67320421 in words is "sixty-seven million, three hundred twenty thousand, four hundred twenty-one".