21563063 has 2 divisors, whose sum is σ = 21563064. Its totient is φ = 21563062.

The previous prime is 21563057. The next prime is 21563077. The reversal of 21563063 is 36036512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21563063 - 2¹⁰ = 21562039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21563023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10781531 + 10781532.

It is an arithmetic number, because the mean of its divisors is an integer number (10781532).

Almost surely, 2^21563063 is an apocalyptic number.

21563063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21563063 is an equidigital number, since it uses as much as digits as its factorization.

21563063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 21563063 is about 4643.6045266581. The cubic root of 21563063 is about 278.3364928068.

Adding to 21563063 its reverse (36036512), we get a palindrome (57599575).

The spelling of 21563063 in words is "twenty-one million, five hundred sixty-three thousand, sixty-three".