21544203201 has 8 divisors (see below), whose sum is σ = 29974543680. Its totient is φ = 13738332432.

The previous prime is 21544203193. The next prime is 21544203203. The reversal of 21544203201 is 10230244512.

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

It is not a de Polignac number, because 21544203201 - 2³ = 21544203193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21544203203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156117346 + ... + 156117483.

It is an arithmetic number, because the mean of its divisors is an integer number (3746817960).

Almost surely, 2^21544203201 is an apocalyptic number.

It is an amenable number.

21544203201 is a deficient number, since it is larger than the sum of its proper divisors (8430340479).

21544203201 is a wasteful number, since it uses less digits than its factorization.

21544203201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312234855.

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21544203201 its reverse (10230244512), we get a palindrome (31774447713).

The spelling of 21544203201 in words is "twenty-one billion, five hundred forty-four million, two hundred three thousand, two hundred one".