21301244505 has 12 divisors (see below), whose sum is σ = 36922157220. Its totient is φ = 11360663712.

The previous prime is 21301244501. The next prime is 21301244609. The reversal of 21301244505 is 50544210312.

21301244505 is a `hidden beast` number, since 2 + 1 + 30 + 124 + 4 + 505 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2960230464 + 18341014041 = 54408^2 + 135429^2 .

It is not a de Polignac number, because 21301244505 - 2² = 21301244501 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21301244501) 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 11 ways as a sum of consecutive naturals, for example, 236680450 + ... + 236680539.

It is an arithmetic number, because the mean of its divisors is an integer number (3076846435).

Almost surely, 2^21301244505 is an apocalyptic number.

It is an amenable number.

21301244505 is a deficient number, since it is larger than the sum of its proper divisors (15620912715).

21301244505 is a wasteful number, since it uses less digits than its factorization.

21301244505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473361000 (or 473360997 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 21301244505 its reverse (50544210312), we get a palindrome (71845454817).

The spelling of 21301244505 in words is "twenty-one billion, three hundred one million, two hundred forty-four thousand, five hundred five".