21044455005 has 32 divisors (see below), whose sum is σ = 40506624000. Its totient is φ = 9113988672.

The previous prime is 21044455001. The next prime is 21044455021. The reversal of 21044455005 is 50055444012.

It is not a de Polignac number, because 21044455005 - 2² = 21044455001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044455001) by changing a digit.

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, 5272305 + ... + 5276294.

It is an arithmetic number, because the mean of its divisors is an integer number (1265832000).

Almost surely, 2^21044455005 is an apocalyptic number.

It is an amenable number.

21044455005 is a deficient number, since it is larger than the sum of its proper divisors (19462168995).

21044455005 is a wasteful number, since it uses less digits than its factorization.

21044455005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10548633.

The product of its (nonzero) digits is 16000, while the sum is 30.

Adding to 21044455005 its reverse (50055444012), we get a palindrome (71099899017).

The spelling of 21044455005 in words is "twenty-one billion, forty-four million, four hundred fifty-five thousand, five".