21289820572 has 72 divisors (see below), whose sum is σ = 39550750512.
Its totient is φ = 10017976320.
The previous prime is 21289820569. The next prime is 21289820599. The reversal of 21289820572 is 27502898212.
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 in 23 ways as a sum of consecutive naturals, for example, 36897148 + ... + 36897724.
Almost surely, 221289820572 is an apocalyptic number.
It is an amenable number.
21289820572 is a deficient number, since it is larger than the sum of its proper divisors (18260929940).
21289820572 is a wasteful number, since it uses less digits than its factorization.
21289820572 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 807 (or 744 counting only the distinct ones).
The product of its (nonzero) digits is 322560, while the sum is 46.
The spelling of 21289820572 in words is "twenty-one billion, two hundred eighty-nine million, eight hundred twenty thousand, five hundred seventy-two".