8466421 has 2 divisors, whose sum is σ = 8466422. Its totient is φ = 8466420.

The previous prime is 8466413. The next prime is 8466427. The reversal of 8466421 is 1246648.

8466421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6320196 + 2146225 = 2514^2 + 1465^2 .

It is a cyclic number.

It is not a de Polignac number, because 8466421 - 2³ = 8466413 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8466427) 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, 4233210 + 4233211.

It is an arithmetic number, because the mean of its divisors is an integer number (4233211).

Almost surely, 2^8466421 is an apocalyptic number.

It is an amenable number.

8466421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8466421 is an equidigital number, since it uses as much as digits as its factorization.

8466421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 31.

The square root of 8466421 is about 2909.7114977262. The cubic root of 8466421 is about 203.8136594588.

The spelling of 8466421 in words is "eight million, four hundred sixty-six thousand, four hundred twenty-one".