21484571 has 2 divisors, whose sum is σ = 21484572. Its totient is φ = 21484570.

The previous prime is 21484543. The next prime is 21484591. The reversal of 21484571 is 17548412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21484571 is a prime.

It is not a weakly prime, because it can be changed into another prime (21484501) 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, 10742285 + 10742286.

It is an arithmetic number, because the mean of its divisors is an integer number (10742286).

Almost surely, 2^21484571 is an apocalyptic number.

21484571 is a deficient number, since it is larger than the sum of its proper divisors (1).

21484571 is an equidigital number, since it uses as much as digits as its factorization.

21484571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8960, while the sum is 32.

The square root of 21484571 is about 4635.1451972943. The cubic root of 21484571 is about 277.9983567006.

The spelling of 21484571 in words is "twenty-one million, four hundred eighty-four thousand, five hundred seventy-one".