21224544555503 has 4 divisors (see below), whose sum is σ = 21230294909928. Its totient is φ = 21218794201080.

The previous prime is 21224544555497. The next prime is 21224544555517. The reversal of 21224544555503 is 30555544542212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21224544555503 - 2¹⁴ = 21224544539119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224544555523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2875171676 + ... + 2875179057.

It is an arithmetic number, because the mean of its divisors is an integer number (5307573727482).

Almost surely, 2^{21224544555503} is an apocalyptic number.

21224544555503 is a deficient number, since it is larger than the sum of its proper divisors (5750354425).

21224544555503 is an equidigital number, since it uses as much as digits as its factorization.

21224544555503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5750354424.

The product of its (nonzero) digits is 4800000, while the sum is 47.

The spelling of 21224544555503 in words is "twenty-one trillion, two hundred twenty-four billion, five hundred forty-four million, five hundred fifty-five thousand, five hundred three".