21440551445205 has 8 divisors (see below), whose sum is σ = 34304882312352. Its totient is φ = 11434960770768.

The previous prime is 21440551445177. The next prime is 21440551445279. The reversal of 21440551445205 is 50254415504412.

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

It is not a de Polignac number, because 21440551445205 - 2⁷ = 21440551445077 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 714685048159 + ... + 714685048188.

It is an arithmetic number, because the mean of its divisors is an integer number (4288110289044).

Almost surely, 2^{21440551445205} is an apocalyptic number.

It is an amenable number.

21440551445205 is a deficient number, since it is larger than the sum of its proper divisors (12864330867147).

21440551445205 is a wasteful number, since it uses less digits than its factorization.

21440551445205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1429370096355.

The product of its (nonzero) digits is 640000, while the sum is 42.

Adding to 21440551445205 its reverse (50254415504412), we get a palindrome (71694966949617).

The spelling of 21440551445205 in words is "twenty-one trillion, four hundred forty billion, five hundred fifty-one million, four hundred forty-five thousand, two hundred five".