67371721 has 2 divisors, whose sum is σ = 67371722. Its totient is φ = 67371720.

The previous prime is 67371677. The next prime is 67371743. The reversal of 67371721 is 12717376.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66194496 + 1177225 = 8136^2 + 1085^2 .

It is a cyclic number.

It is not a de Polignac number, because 67371721 - 2¹³ = 67363529 is a prime.

It is not a weakly prime, because it can be changed into another prime (67377721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33685860 + 33685861.

It is an arithmetic number, because the mean of its divisors is an integer number (33685861).

Almost surely, 2^67371721 is an apocalyptic number.

It is an amenable number.

67371721 is a deficient number, since it is larger than the sum of its proper divisors (1).

67371721 is an equidigital number, since it uses as much as digits as its factorization.

67371721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12348, while the sum is 34.

The square root of 67371721 is about 8208.0278386467. The cubic root of 67371721 is about 406.9045509419.

The spelling of 67371721 in words is "sixty-seven million, three hundred seventy-one thousand, seven hundred twenty-one".