21321123320324 has 24 divisors (see below), whose sum is σ = 37541328309408. Its totient is φ = 10595031102720.

The previous prime is 21321123320191. The next prime is 21321123320327. The reversal of 21321123320324 is 42302332112312.

It is a super-2 number, since 2×21321123320324² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21321123320327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76327799 + ... + 76606625.

It is an arithmetic number, because the mean of its divisors is an integer number (1564222012892).

Almost surely, 2^{21321123320324} is an apocalyptic number.

It is an amenable number.

21321123320324 is a deficient number, since it is larger than the sum of its proper divisors (16220204989084).

21321123320324 is a wasteful number, since it uses less digits than its factorization.

21321123320324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396275 (or 396273 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

Adding to 21321123320324 its reverse (42302332112312), we get a palindrome (63623455432636).

The spelling of 21321123320324 in words is "twenty-one trillion, three hundred twenty-one billion, one hundred twenty-three million, three hundred twenty thousand, three hundred twenty-four".