21663204233361 has 8 divisors (see below), whose sum is σ = 28893994393824. Its totient is φ = 14437275114240.

The previous prime is 21663204233347. The next prime is 21663204233389. The reversal of 21663204233361 is 16333240236612.

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

It is not a de Polignac number, because 21663204233361 - 2¹¹ = 21663204231313 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21663204232361) 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, 1215249936 + ... + 1215267761.

It is an arithmetic number, because the mean of its divisors is an integer number (3611749299228).

Almost surely, 2^{21663204233361} is an apocalyptic number.

It is an amenable number.

21663204233361 is a deficient number, since it is larger than the sum of its proper divisors (7230790160463).

21663204233361 is a wasteful number, since it uses less digits than its factorization.

21663204233361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2430520671.

The product of its (nonzero) digits is 559872, while the sum is 42.

Adding to 21663204233361 its reverse (16333240236612), we get a palindrome (37996444469973).

The spelling of 21663204233361 in words is "twenty-one trillion, six hundred sixty-three billion, two hundred four million, two hundred thirty-three thousand, three hundred sixty-one".