21232450305 has 96 divisors (see below), whose sum is σ = 42909429888. Its totient is φ = 9598003200.

The previous prime is 21232450303. The next prime is 21232450331. The reversal of 21232450305 is 50305423212.

It is a happy number.

It is not a de Polignac number, because 21232450305 - 2¹ = 21232450303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21232450303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 888615 + ... + 912195.

It is an arithmetic number, because the mean of its divisors is an integer number (446973228).

Almost surely, 2^21232450305 is an apocalyptic number.

It is an amenable number.

21232450305 is an abundant number, since it is smaller than the sum of its proper divisors (21676979583).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21232450305 is a wasteful number, since it uses less digits than its factorization.

21232450305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23727 (or 23724 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

Adding to 21232450305 its reverse (50305423212), we get a palindrome (71537873517).

The spelling of 21232450305 in words is "twenty-one billion, two hundred thirty-two million, four hundred fifty thousand, three hundred five".