21563210230 has 32 divisors (see below), whose sum is σ = 39091175424. Its totient is φ = 8563847136.

The previous prime is 21563210209. The next prime is 21563210233. The reversal of 21563210230 is 3201236512.

It is a junction number, because it is equal to n+sod(n) for n = 21563210195 and 21563210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21563210233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 841467 + ... + 866713.

It is an arithmetic number, because the mean of its divisors is an integer number (1221599232).

Almost surely, 2^21563210230 is an apocalyptic number.

21563210230 is a deficient number, since it is larger than the sum of its proper divisors (17527965194).

21563210230 is a wasteful number, since it uses less digits than its factorization.

21563210230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25860.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 21563210230 its reverse (3201236512), we get a palindrome (24764446742).

The spelling of 21563210230 in words is "twenty-one billion, five hundred sixty-three million, two hundred ten thousand, two hundred thirty".