17421871 has 2 divisors, whose sum is σ = 17421872. Its totient is φ = 17421870.

The previous prime is 17421869. The next prime is 17421881. The reversal of 17421871 is 17812471.

It is a weak prime.

It is an emirp because it is prime and its reverse (17812471) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17421871 - 2¹ = 17421869 is a prime.

Together with 17421869, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17421851) 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, 8710935 + 8710936.

It is an arithmetic number, because the mean of its divisors is an integer number (8710936).

Almost surely, 2^17421871 is an apocalyptic number.

17421871 is a deficient number, since it is larger than the sum of its proper divisors (1).

17421871 is an equidigital number, since it uses as much as digits as its factorization.

17421871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3136, while the sum is 31.

The square root of 17421871 is about 4173.9514851038. The cubic root of 17421871 is about 259.2377626150.

The spelling of 17421871 in words is "seventeen million, four hundred twenty-one thousand, eight hundred seventy-one".