21044344201 has 6 divisors (see below), whose sum is σ = 21999097610. Its totient is φ = 20129372208.

The previous prime is 21044344199. The next prime is 21044344207. The reversal of 21044344201 is 10244344012.

It can be written as a sum of positive squares in only one way, i.e., 16518418576 + 4525925625 = 128524^2 + 67275^2 .

It is not a de Polignac number, because 21044344201 - 2¹ = 21044344199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21044344207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19890156 + ... + 19891213.

Almost surely, 2^21044344201 is an apocalyptic number.

It is an amenable number.

21044344201 is a deficient number, since it is larger than the sum of its proper divisors (954753409).

21044344201 is an equidigital number, since it uses as much as digits as its factorization.

21044344201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39781415 (or 39781392 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21044344201 its reverse (10244344012), we get a palindrome (31288688213).

The spelling of 21044344201 in words is "twenty-one billion, forty-four million, three hundred forty-four thousand, two hundred one".