21344410505 has 32 divisors (see below), whose sum is σ = 28377354240. Its totient is φ = 15282017280.

The previous prime is 21344410489. The next prime is 21344410541. The reversal of 21344410505 is 50501444312.

It is not a de Polignac number, because 21344410505 - 2⁴ = 21344410489 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 2279864 + ... + 2289206.

It is an arithmetic number, because the mean of its divisors is an integer number (886792320).

Almost surely, 2^21344410505 is an apocalyptic number.

It is an amenable number.

21344410505 is a deficient number, since it is larger than the sum of its proper divisors (7032943735).

21344410505 is a wasteful number, since it uses less digits than its factorization.

21344410505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10001.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 21344410505 its reverse (50501444312), we get a palindrome (71845854817).

The spelling of 21344410505 in words is "twenty-one billion, three hundred forty-four million, four hundred ten thousand, five hundred five".