67424421 has 4 divisors (see below), whose sum is σ = 89899232. Its totient is φ = 44949612.

The previous prime is 67424419. The next prime is 67424443. The reversal of 67424421 is 12442476.

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 67424421 - 2¹ = 67424419 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 (67424921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11237401 + ... + 11237406.

It is an arithmetic number, because the mean of its divisors is an integer number (22474808).

Almost surely, 2^67424421 is an apocalyptic number.

It is an amenable number.

67424421 is a deficient number, since it is larger than the sum of its proper divisors (22474811).

67424421 is a wasteful number, since it uses less digits than its factorization.

67424421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22474810.

The product of its digits is 10752, while the sum is 30.

The square root of 67424421 is about 8211.2374828646. The cubic root of 67424421 is about 407.0106205738.

Adding to 67424421 its reverse (12442476), we get a palindrome (79866897).

The spelling of 67424421 in words is "sixty-seven million, four hundred twenty-four thousand, four hundred twenty-one".