21636775484 has 6 divisors (see below), whose sum is σ = 37864357104. Its totient is φ = 10818387740.

The previous prime is 21636775463. The next prime is 21636775499. The reversal of 21636775484 is 48457763612.

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, 2704596932 + ... + 2704596939.

It is an arithmetic number, because the mean of its divisors is an integer number (6310726184).

Almost surely, 2^21636775484 is an apocalyptic number.

It is an amenable number.

21636775484 is a deficient number, since it is larger than the sum of its proper divisors (16227581620).

21636775484 is a wasteful number, since it uses less digits than its factorization.

21636775484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5409193875 (or 5409193873 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 53.

The spelling of 21636775484 in words is "twenty-one billion, six hundred thirty-six million, seven hundred seventy-five thousand, four hundred eighty-four".