21242120324024 has 8 divisors (see below), whose sum is σ = 39828975607560. Its totient is φ = 10621060162008.

The previous prime is 21242120323993. The next prime is 21242120324027. The reversal of 21242120324024 is 42042302124212.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242120324027) 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 as a sum of consecutive naturals, namely, 1327632520244 + ... + 1327632520259.

It is an arithmetic number, because the mean of its divisors is an integer number (4978621950945).

Almost surely, 2^{21242120324024} is an apocalyptic number.

It is an amenable number.

21242120324024 is a deficient number, since it is larger than the sum of its proper divisors (18586855283536).

21242120324024 is a wasteful number, since it uses less digits than its factorization.

21242120324024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2655265040509 (or 2655265040505 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 21242120324024 its reverse (42042302124212), we get a palindrome (63284422448236).

The spelling of 21242120324024 in words is "twenty-one trillion, two hundred forty-two billion, one hundred twenty million, three hundred twenty-four thousand, twenty-four".