21201324441 has 32 divisors (see below), whose sum is σ = 31126467456. Its totient is φ = 12729600000.

The previous prime is 21201324407. The next prime is 21201324449. The reversal of 21201324441 is 14442310212.

It is not a de Polignac number, because 21201324441 - 2¹¹ = 21201322393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21201324449) 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 31 ways as a sum of consecutive naturals, for example, 2350941 + ... + 2359941.

It is an arithmetic number, because the mean of its divisors is an integer number (972702108).

Almost surely, 2^21201324441 is an apocalyptic number.

It is an amenable number.

21201324441 is a deficient number, since it is larger than the sum of its proper divisors (9925143015).

21201324441 is a wasteful number, since it uses less digits than its factorization.

21201324441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9673.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21201324441 its reverse (14442310212), we get a palindrome (35643634653).

The spelling of 21201324441 in words is "twenty-one billion, two hundred one million, three hundred twenty-four thousand, four hundred forty-one".