21010250563 has 2 divisors, whose sum is σ = 21010250564. Its totient is φ = 21010250562.

The previous prime is 21010250561. The next prime is 21010250579. The reversal of 21010250563 is 36505201012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21010250563 - 2¹ = 21010250561 is a prime.

Together with 21010250561, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21010250561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505125281 + 10505125282.

It is an arithmetic number, because the mean of its divisors is an integer number (10505125282).

Almost surely, 2^21010250563 is an apocalyptic number.

21010250563 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010250563 is an equidigital number, since it uses as much as digits as its factorization.

21010250563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 21010250563 its reverse (36505201012), we get a palindrome (57515451575).

The spelling of 21010250563 in words is "twenty-one billion, ten million, two hundred fifty thousand, five hundred sixty-three".