21485673565 has 8 divisors (see below), whose sum is σ = 26167626720. Its totient is φ = 16931993232.

The previous prime is 21485673557. The next prime is 21485673593. The reversal of 21485673565 is 56537658412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21485673565 - 2³ = 21485673557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32067835 + ... + 32068504.

It is an arithmetic number, because the mean of its divisors is an integer number (3270953340).

Almost surely, 2^21485673565 is an apocalyptic number.

It is an amenable number.

21485673565 is a deficient number, since it is larger than the sum of its proper divisors (4681953155).

21485673565 is an equidigital number, since it uses as much as digits as its factorization.

21485673565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64136411.

The product of its digits is 6048000, while the sum is 52.

The spelling of 21485673565 in words is "twenty-one billion, four hundred eighty-five million, six hundred seventy-three thousand, five hundred sixty-five".