21440230240232 has 8 divisors (see below), whose sum is σ = 40200431700450. Its totient is φ = 10720115120112.

The previous prime is 21440230240181. The next prime is 21440230240237. The reversal of 21440230240232 is 23204203204412.

It can be written as a sum of positive squares in only one way, i.e., 17662905831076 + 3777324409156 = 4202726^2 + 1943534^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21440230240195 and 21440230240204.

It is not an unprimeable number, because it can be changed into a prime (21440230240237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1340014390007 + ... + 1340014390022.

Almost surely, 2^{21440230240232} is an apocalyptic number.

It is an amenable number.

21440230240232 is a deficient number, since it is larger than the sum of its proper divisors (18760201460218).

21440230240232 is a wasteful number, since it uses less digits than its factorization.

21440230240232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2680028780035 (or 2680028780031 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 21440230240232 its reverse (23204203204412), we get a palindrome (44644433444644).

The spelling of 21440230240232 in words is "twenty-one trillion, four hundred forty billion, two hundred thirty million, two hundred forty thousand, two hundred thirty-two".