21046171 has 2 divisors, whose sum is σ = 21046172. Its totient is φ = 21046170.

The previous prime is 21046169. The next prime is 21046217. The reversal of 21046171 is 17164012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21046171 - 2¹ = 21046169 is a prime.

It is a super-2 number, since 2×21046171² = 885882627522482, which contains 22 as substring.

Together with 21046169, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21046111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10523085 + 10523086.

It is an arithmetic number, because the mean of its divisors is an integer number (10523086).

Almost surely, 2^21046171 is an apocalyptic number.

21046171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21046171 is an equidigital number, since it uses as much as digits as its factorization.

21046171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 21046171 is about 4587.6105981219. The cubic root of 21046171 is about 276.0944637444.

The spelling of 21046171 in words is "twenty-one million, forty-six thousand, one hundred seventy-one".