21466171 has 2 divisors, whose sum is σ = 21466172. Its totient is φ = 21466170.

The previous prime is 21466163. The next prime is 21466183. The reversal of 21466171 is 17166412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21466171 - 2³ = 21466163 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21466141) 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, 10733085 + 10733086.

It is an arithmetic number, because the mean of its divisors is an integer number (10733086).

Almost surely, 2^21466171 is an apocalyptic number.

21466171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21466171 is an equidigital number, since it uses as much as digits as its factorization.

21466171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 28.

The square root of 21466171 is about 4633.1599368034. The cubic root of 21466171 is about 277.9189721240.

The spelling of 21466171 in words is "twenty-one million, four hundred sixty-six thousand, one hundred seventy-one".