21289820570 has 16 divisors (see below), whose sum is σ = 38323853568. Its totient is φ = 8515444560.

The previous prime is 21289820569. The next prime is 21289820599. The reversal of 21289820570 is 7502898212.

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 7 ways as a sum of consecutive naturals, for example, 164147 + ... + 263673.

It is an arithmetic number, because the mean of its divisors is an integer number (2395240848).

Almost surely, 2^21289820570 is an apocalyptic number.

21289820570 is a deficient number, since it is larger than the sum of its proper divisors (17034032998).

21289820570 is a wasteful number, since it uses less digits than its factorization.

21289820570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120925.

The product of its (nonzero) digits is 161280, while the sum is 44.

The spelling of 21289820570 in words is "twenty-one billion, two hundred eighty-nine million, eight hundred twenty thousand, five hundred seventy".