21544063 has 2 divisors, whose sum is σ = 21544064. Its totient is φ = 21544062.

The previous prime is 21544057. The next prime is 21544069. The reversal of 21544063 is 36044512.

It is a balanced prime because it is at equal distance from previous prime (21544057) and next prime (21544069).

It is a cyclic number.

It is not a de Polignac number, because 21544063 - 2⁹ = 21543551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21544069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10772031 + 10772032.

It is an arithmetic number, because the mean of its divisors is an integer number (10772032).

Almost surely, 2^21544063 is an apocalyptic number.

21544063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21544063 is an equidigital number, since it uses as much as digits as its factorization.

21544063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 21544063 is about 4641.5582512773. The cubic root of 21544063 is about 278.2547179775.

Adding to 21544063 its reverse (36044512), we get a palindrome (57588575).

The spelling of 21544063 in words is "twenty-one million, five hundred forty-four thousand, sixty-three".