21544241203 has 4 divisors (see below), whose sum is σ = 21578384848. Its totient is φ = 21510097560.

The previous prime is 21544241183. The next prime is 21544241209. The reversal of 21544241203 is 30214244512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21544241203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21544241209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17070876 + ... + 17072137.

It is an arithmetic number, because the mean of its divisors is an integer number (5394596212).

Almost surely, 2^21544241203 is an apocalyptic number.

21544241203 is a deficient number, since it is larger than the sum of its proper divisors (34143645).

21544241203 is an equidigital number, since it uses as much as digits as its factorization.

21544241203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34143644.

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 21544241203 its reverse (30214244512), we get a palindrome (51758485715).

The spelling of 21544241203 in words is "twenty-one billion, five hundred forty-four million, two hundred forty-one thousand, two hundred three".