67671421 has 2 divisors, whose sum is σ = 67671422. Its totient is φ = 67671420.

The previous prime is 67671403. The next prime is 67671427. The reversal of 67671421 is 12417676.

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., 62631396 + 5040025 = 7914^2 + 2245^2 .

It is a cyclic number.

It is not a de Polignac number, because 67671421 - 2⁵ = 67671389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67671427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33835710 + 33835711.

It is an arithmetic number, because the mean of its divisors is an integer number (33835711).

Almost surely, 2^67671421 is an apocalyptic number.

It is an amenable number.

67671421 is a deficient number, since it is larger than the sum of its proper divisors (1).

67671421 is an equidigital number, since it uses as much as digits as its factorization.

67671421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 34.

The square root of 67671421 is about 8226.2640973895. The cubic root of 67671421 is about 407.5070238542.

The spelling of 67671421 in words is "sixty-seven million, six hundred seventy-one thousand, four hundred twenty-one".