21544323204 has 24 divisors (see below), whose sum is σ = 50294442240. Its totient is φ = 7177961824.

The previous prime is 21544323179. The next prime is 21544323257. The reversal of 21544323204 is 40232344512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 409044 + ... + 458699.

It is an arithmetic number, because the mean of its divisors is an integer number (2095601760).

Almost surely, 2^21544323204 is an apocalyptic number.

It is an amenable number.

21544323204 is an abundant number, since it is smaller than the sum of its proper divisors (28750119036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21544323204 is a wasteful number, since it uses less digits than its factorization.

21544323204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869819 (or 869817 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 30.

Adding to 21544323204 its reverse (40232344512), we get a palindrome (61776667716).

The spelling of 21544323204 in words is "twenty-one billion, five hundred forty-four million, three hundred twenty-three thousand, two hundred four".