21455444221135 has 8 divisors (see below), whose sum is σ = 25746916664160. Its totient is φ = 17164099644384.

The previous prime is 21455444221109. The next prime is 21455444221151. The reversal of 21455444221135 is 53112244455412.

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 21455444221135 - 2¹¹ = 21455444219087 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21455444221091 and 21455444221100.

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, 31597027 + ... + 32268916.

It is an arithmetic number, because the mean of its divisors is an integer number (3218364583020).

Almost surely, 2^{21455444221135} is an apocalyptic number.

21455444221135 is a deficient number, since it is larger than the sum of its proper divisors (4291472443025).

21455444221135 is an equidigital number, since it uses as much as digits as its factorization.

21455444221135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63933137.

The product of its digits is 768000, while the sum is 43.

Adding to 21455444221135 its reverse (53112244455412), we get a palindrome (74567688676547).

The spelling of 21455444221135 in words is "twenty-one trillion, four hundred fifty-five billion, four hundred forty-four million, two hundred twenty-one thousand, one hundred thirty-five".