21160546565 has 16 divisors (see below), whose sum is σ = 25946548992. Its totient is φ = 16559553984.

The previous prime is 21160546553. The next prime is 21160546567. The reversal of 21160546565 is 56564506112.

It is a cyclic number.

It is not a de Polignac number, because 21160546565 - 2¹⁶ = 21160481029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21160546567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 444287 + ... + 489603.

It is an arithmetic number, because the mean of its divisors is an integer number (1621659312).

Almost surely, 2^21160546565 is an apocalyptic number.

It is an amenable number.

21160546565 is a deficient number, since it is larger than the sum of its proper divisors (4786002427).

21160546565 is a wasteful number, since it uses less digits than its factorization.

21160546565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47356.

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 21160546565 in words is "twenty-one billion, one hundred sixty million, five hundred forty-six thousand, five hundred sixty-five".