21663203253063 has 8 divisors (see below), whose sum is σ = 29249894688000. Its totient is φ = 14259323660088.

The previous prime is 21663203253059. The next prime is 21663203253101. The reversal of 21663203253063 is 36035230236612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21663203253063 - 2² = 21663203253059 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21663203253023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45702960213 + ... + 45702960686.

It is an arithmetic number, because the mean of its divisors is an integer number (3656236836000).

Almost surely, 2^{21663203253063} is an apocalyptic number.

21663203253063 is a deficient number, since it is larger than the sum of its proper divisors (7586691434937).

21663203253063 is an equidigital number, since it uses as much as digits as its factorization.

21663203253063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91405920981.

The product of its (nonzero) digits is 699840, while the sum is 42.

Adding to 21663203253063 its reverse (36035230236612), we get a palindrome (57698433489675).

The spelling of 21663203253063 in words is "twenty-one trillion, six hundred sixty-three billion, two hundred three million, two hundred fifty-three thousand, sixty-three".