67345021 has 2 divisors, whose sum is σ = 67345022. Its totient is φ = 67345020.

The previous prime is 67345013. The next prime is 67345039. The reversal of 67345021 is 12054376.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59892121 + 7452900 = 7739^2 + 2730^2 .

It is a cyclic number.

It is not a de Polignac number, because 67345021 - 2³ = 67345013 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67342021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33672510 + 33672511.

It is an arithmetic number, because the mean of its divisors is an integer number (33672511).

Almost surely, 2^67345021 is an apocalyptic number.

It is an amenable number.

67345021 is a deficient number, since it is larger than the sum of its proper divisors (1).

67345021 is an equidigital number, since it uses as much as digits as its factorization.

67345021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 67345021 is about 8206.4012209982. The cubic root of 67345021 is about 406.8507905665.

Adding to 67345021 its reverse (12054376), we get a palindrome (79399397).

The spelling of 67345021 in words is "sixty-seven million, three hundred forty-five thousand, twenty-one".