21144430205 has 8 divisors (see below), whose sum is σ = 25963393632. Its totient is φ = 16522159248.

The previous prime is 21144430157. The next prime is 21144430247. The reversal of 21144430205 is 50203444112.

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 21144430205 - 2¹⁰ = 21144429181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49172879 + ... + 49173308.

It is an arithmetic number, because the mean of its divisors is an integer number (3245424204).

Almost surely, 2^21144430205 is an apocalyptic number.

It is an amenable number.

21144430205 is a deficient number, since it is larger than the sum of its proper divisors (4818963427).

21144430205 is an equidigital number, since it uses as much as digits as its factorization.

21144430205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98346235.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 21144430205 its reverse (50203444112), we get a palindrome (71347874317).

The spelling of 21144430205 in words is "twenty-one billion, one hundred forty-four million, four hundred thirty thousand, two hundred five".