21334171 has 2 divisors, whose sum is σ = 21334172. Its totient is φ = 21334170.

The previous prime is 21334153. The next prime is 21334189. The reversal of 21334171 is 17143312.

It is a balanced prime because it is at equal distance from previous prime (21334153) and next prime (21334189).

It is a cyclic number.

It is not a de Polignac number, because 21334171 - 2⁹ = 21333659 is a prime.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (21734171) 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, 10667085 + 10667086.

It is an arithmetic number, because the mean of its divisors is an integer number (10667086).

Almost surely, 2^21334171 is an apocalyptic number.

21334171 is a deficient number, since it is larger than the sum of its proper divisors (1).

21334171 is an equidigital number, since it uses as much as digits as its factorization.

21334171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 22.

The square root of 21334171 is about 4618.8928327035. The cubic root of 21334171 is about 277.3481397279.

Adding to 21334171 its reverse (17143312), we get a palindrome (38477483).

The spelling of 21334171 in words is "twenty-one million, three hundred thirty-four thousand, one hundred seventy-one".