21663563202034 has 16 divisors (see below), whose sum is σ = 35209679887872. Its totient is φ = 9937226724048.

The previous prime is 21663563202007. The next prime is 21663563202037. The reversal of 21663563202034 is 43020236536612.

It is not an unprimeable number, because it can be changed into a prime (21663563202037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2555866834 + ... + 2555875309.

It is an arithmetic number, because the mean of its divisors is an integer number (2200604992992).

Almost surely, 2^{21663563202034} is an apocalyptic number.

21663563202034 is a deficient number, since it is larger than the sum of its proper divisors (13546116685838).

21663563202034 is a wasteful number, since it uses less digits than its factorization.

21663563202034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5111742321.

The product of its (nonzero) digits is 933120, while the sum is 43.

Adding to 21663563202034 its reverse (43020236536612), we get a palindrome (64683799738646).

The spelling of 21663563202034 in words is "twenty-one trillion, six hundred sixty-three billion, five hundred sixty-three million, two hundred two thousand, thirty-four".