21553530443105 has 8 divisors (see below), whose sum is σ = 25864308132264. Its totient is φ = 17242776620800.

The previous prime is 21553530443047. The next prime is 21553530443117. The reversal of 21553530443105 is 50134403535512.

It can be written as a sum of positive squares in 4 ways, for example, as 535917700096 + 21017612743009 = 732064^2 + 4584497^2 .

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

It is not a de Polignac number, because 21553530443105 - 2¹⁴ = 21553530426721 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3915866 + ... + 7644675.

It is an arithmetic number, because the mean of its divisors is an integer number (3233038516533).

Almost surely, 2^{21553530443105} is an apocalyptic number.

It is an amenable number.

21553530443105 is a deficient number, since it is larger than the sum of its proper divisors (4310777689159).

21553530443105 is a wasteful number, since it uses less digits than its factorization.

21553530443105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11933427.

The product of its (nonzero) digits is 540000, while the sum is 41.

Adding to 21553530443105 its reverse (50134403535512), we get a palindrome (71687933978617).

The spelling of 21553530443105 in words is "twenty-one trillion, five hundred fifty-three billion, five hundred thirty million, four hundred forty-three thousand, one hundred five".