67421 has 2 divisors, whose sum is σ = 67422.
Its totient is φ = 67420.
The previous prime is 67411. The next prime is 67427. The reversal of 67421 is 12476.
Adding to 67421 its reverse (12476), we get a palindrome (79897).
Subtracting from 67421 its reverse (12476), we obtain a palindrome (54945).
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 60025 + 7396 = 245^2 + 86^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-67421 is a prime.
It is a Chen prime.
It is a junction number, because it is equal to n+sod(n) for n = 67393 and 67402.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (67427) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33710 + 33711.
It is an arithmetic number, because the mean of its divisors is an integer number (33711).
267421 is an apocalyptic number.
It is an amenable number.
67421 is a deficient number, since it is larger than the sum of its proper divisors (1).
67421 is an equidigital number, since it uses as much as digits as its factorization.
67421 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 336, while the sum is 20.
The square root of 67421 is about 259.6555410539.
The cubic root of 67421 is about 40.7003736783.
The spelling of 67421 in words is "sixty-seven thousand, four hundred twenty-one".