21040242221224 has 32 divisors (see below), whose sum is σ = 40149477374400. Its totient is φ = 10333984890240.

The previous prime is 21040242221191. The next prime is 21040242221231. The reversal of 21040242221224 is 42212224204012.

It is a junction number, because it is equal to n+sod(n) for n = 21040242221192 and 21040242221201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16248852 + ... + 17495875.

It is an arithmetic number, because the mean of its divisors is an integer number (1254671167950).

Almost surely, 2^{21040242221224} is an apocalyptic number.

It is an amenable number.

21040242221224 is a deficient number, since it is larger than the sum of its proper divisors (19109235153176).

21040242221224 is a wasteful number, since it uses less digits than its factorization.

21040242221224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33746113 (or 33746109 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 28.

Adding to 21040242221224 its reverse (42212224204012), we get a palindrome (63252466425236).

The spelling of 21040242221224 in words is "twenty-one trillion, forty billion, two hundred forty-two million, two hundred twenty-one thousand, two hundred twenty-four".