67322921 has 2 divisors, whose sum is σ = 67322922. Its totient is φ = 67322920.

The previous prime is 67322887. The next prime is 67322923. The reversal of 67322921 is 12922376.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45373696 + 21949225 = 6736^2 + 4685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67322921 is a prime.

It is a Sophie Germain prime.

Together with 67322923, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (67322923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33661460 + 33661461.

It is an arithmetic number, because the mean of its divisors is an integer number (33661461).

Almost surely, 2^67322921 is an apocalyptic number.

It is an amenable number.

67322921 is a deficient number, since it is larger than the sum of its proper divisors (1).

67322921 is an equidigital number, since it uses as much as digits as its factorization.

67322921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 32.

The square root of 67322921 is about 8205.0546006715. The cubic root of 67322921 is about 406.8062815290.

The spelling of 67322921 in words is "sixty-seven million, three hundred twenty-two thousand, nine hundred twenty-one".