21617203124 has 48 divisors (see below), whose sum is σ = 42219830016. Its totient is φ = 9600384000.

The previous prime is 21617203117. The next prime is 21617203163. The reversal of 21617203124 is 42130271612.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1234172 + ... + 1251564.

It is an arithmetic number, because the mean of its divisors is an integer number (879579792).

Almost surely, 2^21617203124 is an apocalyptic number.

It is an amenable number.

21617203124 is a deficient number, since it is larger than the sum of its proper divisors (20602626892).

21617203124 is a wasteful number, since it uses less digits than its factorization.

21617203124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18056 (or 18054 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

Adding to 21617203124 its reverse (42130271612), we get a palindrome (63747474736).

The spelling of 21617203124 in words is "twenty-one billion, six hundred seventeen million, two hundred three thousand, one hundred twenty-four".