21321324444441 has 16 divisors (see below), whose sum is σ = 32493000526208. Its totient is φ = 12182352739200.

The previous prime is 21321324444437. The next prime is 21321324444449. The reversal of 21321324444441 is 14444442312312.

It is a happy number.

It is not a de Polignac number, because 21321324444441 - 2² = 21321324444437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21321324444441.

It is not an unprimeable number, because it can be changed into a prime (21321324444449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52343500 + ... + 52749261.

It is an arithmetic number, because the mean of its divisors is an integer number (2030812532888).

Almost surely, 2^{21321324444441} is an apocalyptic number.

21321324444441 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21321324444441 is a deficient number, since it is larger than the sum of its proper divisors (11171676081767).

21321324444441 is a wasteful number, since it uses less digits than its factorization.

21321324444441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105102432.

The product of its digits is 294912, while the sum is 39.

Adding to 21321324444441 its reverse (14444442312312), we get a palindrome (35765766756753).

The spelling of 21321324444441 in words is "twenty-one trillion, three hundred twenty-one billion, three hundred twenty-four million, four hundred forty-four thousand, four hundred forty-one".