21188878096 has 45 divisors (see below), whose sum is σ = 41499322389. Its totient is φ = 10480608000.

The previous prime is 21188878031. The next prime is 21188878111. The reversal of 21188878096 is 69087888112.

The square root of 21188878096 is 145564.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 15935527696 + 5253350400 = 126236^2 + 72480^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21188878096.

It is an unprimeable number.

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 in 8 ways as a sum of consecutive naturals, for example, 87920536 + ... + 87920776.

Almost surely, 2^21188878096 is an apocalyptic number.

21188878096 is the 145564-th square number.

It is an amenable number.

21188878096 is a deficient number, since it is larger than the sum of its proper divisors (20310444293).

21188878096 is an frugal number, since it uses more digits than its factorization.

21188878096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792 (or 394 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 58.

The spelling of 21188878096 in words is "twenty-one billion, one hundred eighty-eight million, eight hundred seventy-eight thousand, ninety-six".