67240421 has 4 divisors (see below), whose sum is σ = 67496352. Its totient is φ = 66984492.

The previous prime is 67240403. The next prime is 67240441. The reversal of 67240421 is 12404276.

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 67240421 - 2¹⁴ = 67224037 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 (67240441) 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, 127571 + ... + 128096.

It is an arithmetic number, because the mean of its divisors is an integer number (16874088).

Almost surely, 2^67240421 is an apocalyptic number.

It is an amenable number.

67240421 is a deficient number, since it is larger than the sum of its proper divisors (255931).

67240421 is a wasteful number, since it uses less digits than its factorization.

67240421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255930.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 67240421 is about 8200.0256706915. The cubic root of 67240421 is about 406.6400417786.

Adding to 67240421 its reverse (12404276), we get a palindrome (79644697).

It can be divided in two parts, 6 and 7240421, that added together give a palindrome (7240427).

The spelling of 67240421 in words is "sixty-seven million, two hundred forty thousand, four hundred twenty-one".