67224821 has 2 divisors, whose sum is σ = 67224822. Its totient is φ = 67224820.

The previous prime is 67224767. The next prime is 67224823. The reversal of 67224821 is 12842276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58140625 + 9084196 = 7625^2 + 3014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67224821 is a prime.

Together with 67224823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67224823) 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 as a sum of consecutive naturals, namely, 33612410 + 33612411.

It is an arithmetic number, because the mean of its divisors is an integer number (33612411).

Almost surely, 2^67224821 is an apocalyptic number.

It is an amenable number.

67224821 is a deficient number, since it is larger than the sum of its proper divisors (1).

67224821 is an equidigital number, since it uses as much as digits as its factorization.

67224821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 32.

The square root of 67224821 is about 8199.0743989794. The cubic root of 67224821 is about 406.6085920683.

The spelling of 67224821 in words is "sixty-seven million, two hundred twenty-four thousand, eight hundred twenty-one".