21282571 has 2 divisors, whose sum is σ = 21282572. Its totient is φ = 21282570.

The previous prime is 21282559. The next prime is 21282601. The reversal of 21282571 is 17528212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21282571 - 2⁹ = 21282059 is a prime.

It is not a weakly prime, because it can be changed into another prime (21282671) 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, 10641285 + 10641286.

It is an arithmetic number, because the mean of its divisors is an integer number (10641286).

Almost surely, 2^21282571 is an apocalyptic number.

21282571 is a deficient number, since it is larger than the sum of its proper divisors (1).

21282571 is an equidigital number, since it uses as much as digits as its factorization.

21282571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2240, while the sum is 28.

The square root of 21282571 is about 4613.3036969183. The cubic root of 21282571 is about 277.1243560546.

The spelling of 21282571 in words is "twenty-one million, two hundred eighty-two thousand, five hundred seventy-one".