21550404410105 has 8 divisors (see below), whose sum is σ = 26034045597000. Its totient is φ = 17124616658176.

The previous prime is 21550404410081. The next prime is 21550404410131. The reversal of 21550404410105 is 50101440405512.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 528371979664 + 21022032430441 = 726892^2 + 4584979^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21550404410105 - 2¹⁶ = 21550404344569 is a prime.

It is a super-2 number, since 2×21550404410105² (a number of 27 digits) contains 22 as substring.

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, 14463357920 + ... + 14463359409.

It is an arithmetic number, because the mean of its divisors is an integer number (3254255699625).

Almost surely, 2^{21550404410105} is an apocalyptic number.

It is an amenable number.

21550404410105 is a deficient number, since it is larger than the sum of its proper divisors (4483641186895).

21550404410105 is a wasteful number, since it uses less digits than its factorization.

21550404410105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28926717483.

The product of its (nonzero) digits is 16000, while the sum is 32.

Adding to 21550404410105 its reverse (50101440405512), we get a palindrome (71651844815617).

The spelling of 21550404410105 in words is "twenty-one trillion, five hundred fifty billion, four hundred four million, four hundred ten thousand, one hundred five".