21189376448 has 14 divisors (see below), whose sum is σ = 42047669016. Its totient is φ = 10594688192.

The previous prime is 21189376393. The next prime is 21189376457. The reversal of 21189376448 is 84467398112.

It is a self number, because there is not a number n which added to its sum of digits gives 21189376448.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 165541940 + ... + 165542067.

Almost surely, 2^21189376448 is an apocalyptic number.

It is an amenable number.

21189376448 is a deficient number, since it is larger than the sum of its proper divisors (20858292568).

21189376448 is an equidigital number, since it uses as much as digits as its factorization.

21189376448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331084019 (or 331084009 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 53.

The spelling of 21189376448 in words is "twenty-one billion, one hundred eighty-nine million, three hundred seventy-six thousand, four hundred forty-eight".