21144441524 has 12 divisors (see below), whose sum is σ = 37003814400. Its totient is φ = 10571923128.

The previous prime is 21144441497. The next prime is 21144441569. The reversal of 21144441524 is 42514444112.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 189197 + ... + 279435.

It is an arithmetic number, because the mean of its divisors is an integer number (3083651200).

Almost surely, 2^21144441524 is an apocalyptic number.

It is an amenable number.

21144441524 is a deficient number, since it is larger than the sum of its proper divisors (15859372876).

21144441524 is a wasteful number, since it uses less digits than its factorization.

21144441524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148822 (or 148820 counting only the distinct ones).

The product of its digits is 20480, while the sum is 32.

Adding to 21144441524 its reverse (42514444112), we get a palindrome (63658885636).

The spelling of 21144441524 in words is "twenty-one billion, one hundred forty-four million, four hundred forty-one thousand, five hundred twenty-four".