67273421 has 2 divisors, whose sum is σ = 67273422. Its totient is φ = 67273420.

The previous prime is 67273399. The next prime is 67273429. The reversal of 67273421 is 12437276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60668521 + 6604900 = 7789^2 + 2570^2 .

It is a cyclic number.

It is not a de Polignac number, because 67273421 - 2¹⁰ = 67272397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67273429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33636710 + 33636711.

It is an arithmetic number, because the mean of its divisors is an integer number (33636711).

Almost surely, 2^67273421 is an apocalyptic number.

It is an amenable number.

67273421 is a deficient number, since it is larger than the sum of its proper divisors (1).

67273421 is an equidigital number, since it uses as much as digits as its factorization.

67273421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 32.

The square root of 67273421 is about 8202.0376126911. The cubic root of 67273421 is about 406.7065539872.

The spelling of 67273421 in words is "sixty-seven million, two hundred seventy-three thousand, four hundred twenty-one".