21663413103205 has 8 divisors (see below), whose sum is σ = 25996132406304. Its totient is φ = 17330706027600.

The previous prime is 21663413103041. The next prime is 21663413103217. The reversal of 21663413103205 is 50230131436612.

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

It is not a de Polignac number, because 21663413103205 - 2¹³ = 21663413095013 is a prime.

It is a super-2 number, since 2×21663413103205² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1443070 + ... + 6738640.

It is an arithmetic number, because the mean of its divisors is an integer number (3249516550788).

Almost surely, 2^{21663413103205} is an apocalyptic number.

It is an amenable number.

21663413103205 is a deficient number, since it is larger than the sum of its proper divisors (4332719303099).

21663413103205 is an equidigital number, since it uses as much as digits as its factorization.

21663413103205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6113747.

The product of its (nonzero) digits is 77760, while the sum is 37.

Adding to 21663413103205 its reverse (50230131436612), we get a palindrome (71893544539817).

The spelling of 21663413103205 in words is "twenty-one trillion, six hundred sixty-three billion, four hundred thirteen million, one hundred three thousand, two hundred five".