21083270565 has 16 divisors (see below), whose sum is σ = 38552266368. Its totient is φ = 9638066496.

The previous prime is 21083270513. The next prime is 21083270569. The reversal of 21083270565 is 56507238012.

It is not a de Polignac number, because 21083270565 - 2⁷ = 21083270437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21083270569) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 100396422 + ... + 100396631.

It is an arithmetic number, because the mean of its divisors is an integer number (2409516648).

Almost surely, 2^21083270565 is an apocalyptic number.

It is an amenable number.

21083270565 is a deficient number, since it is larger than the sum of its proper divisors (17468995803).

21083270565 is a wasteful number, since it uses less digits than its factorization.

21083270565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200793068.

The product of its (nonzero) digits is 100800, while the sum is 39.

The spelling of 21083270565 in words is "twenty-one billion, eighty-three million, two hundred seventy thousand, five hundred sixty-five".