9721144442 has 24 divisors (see below), whose sum is σ = 16163417376. Its totient is φ = 4375752128.

The previous prime is 9721144441. The next prime is 9721144453. The reversal of 9721144442 is 2444411279.

9721144442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 9721144396 and 9721144405.

It is not an unprimeable number, because it can be changed into a prime (9721144441) 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 11 ways as a sum of consecutive naturals, for example, 352328 + ... + 378915.

It is an arithmetic number, because the mean of its divisors is an integer number (673475724).

Almost surely, 2^9721144442 is an apocalyptic number.

9721144442 is a deficient number, since it is larger than the sum of its proper divisors (6442272934).

9721144442 is a wasteful number, since it uses less digits than its factorization.

9721144442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731302 (or 731285 counting only the distinct ones).

The product of its digits is 64512, while the sum is 38.

The square root of 9721144442 is about 98595.8642236073. The cubic root of 9721144442 is about 2134.2197378038.

The spelling of 9721144442 in words is "nine billion, seven hundred twenty-one million, one hundred forty-four thousand, four hundred forty-two".