21441144304505 has 8 divisors (see below), whose sum is σ = 25736370569352. Its totient is φ = 17148250507648.

The previous prime is 21441144304501. The next prime is 21441144304511. The reversal of 21441144304505 is 50540344114412.

It can be written as a sum of positive squares in 4 ways, for example, as 11609809138489 + 9831335166016 = 3407317^2 + 3135496^2 .

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 21441144304505 - 2² = 21441144304501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21441144304501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 583096772 + ... + 583133541.

It is an arithmetic number, because the mean of its divisors is an integer number (3217046321169).

Almost surely, 2^{21441144304505} is an apocalyptic number.

It is an amenable number.

21441144304505 is a deficient number, since it is larger than the sum of its proper divisors (4295226264847).

21441144304505 is a wasteful number, since it uses less digits than its factorization.

21441144304505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166233995.

The product of its (nonzero) digits is 153600, while the sum is 38.

Adding to 21441144304505 its reverse (50540344114412), we get a palindrome (71981488418917).

The spelling of 21441144304505 in words is "twenty-one trillion, four hundred forty-one billion, one hundred forty-four million, three hundred four thousand, five hundred five".