21321522124424 has 32 divisors (see below), whose sum is σ = 40475971620000. Its totient is φ = 10528034180352.

The previous prime is 21321522124421. The next prime is 21321522124453. The reversal of 21321522124424 is 42442122512312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21321522124421) 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, 4896449 + ... + 8162000.

It is an arithmetic number, because the mean of its divisors is an integer number (1264874113125).

Almost surely, 2^{21321522124424} is an apocalyptic number.

It is an amenable number.

21321522124424 is a deficient number, since it is larger than the sum of its proper divisors (19154449495576).

21321522124424 is a wasteful number, since it uses less digits than its factorization.

21321522124424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13060997 (or 13060993 counting only the distinct ones).

The product of its digits is 61440, while the sum is 35.

Adding to 21321522124424 its reverse (42442122512312), we get a palindrome (63763644636736).

The spelling of 21321522124424 in words is "twenty-one trillion, three hundred twenty-one billion, five hundred twenty-two million, one hundred twenty-four thousand, four hundred twenty-four".