21118449776 has 10 divisors (see below), whose sum is σ = 40916996472. Its totient is φ = 10559224880.

The previous prime is 21118449763. The next prime is 21118449797. The reversal of 21118449776 is 67794481112.

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 as a sum of consecutive naturals, namely, 659951540 + ... + 659951571.

Almost surely, 2^21118449776 is an apocalyptic number.

It is an amenable number.

21118449776 is a deficient number, since it is larger than the sum of its proper divisors (19798546696).

21118449776 is a wasteful number, since it uses less digits than its factorization.

21118449776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319903119 (or 1319903113 counting only the distinct ones).

The product of its digits is 677376, while the sum is 50.

The spelling of 21118449776 in words is "twenty-one billion, one hundred eighteen million, four hundred forty-nine thousand, seven hundred seventy-six".