21436569265 has 32 divisors (see below), whose sum is σ = 26398233216. Its totient is φ = 16706511360.

The previous prime is 21436569241. The next prime is 21436569311. The reversal of 21436569265 is 56296563412.

It is not a de Polignac number, because 21436569265 - 2⁵ = 21436569233 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian 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 31 ways as a sum of consecutive naturals, for example, 12227629 + ... + 12229381.

It is an arithmetic number, because the mean of its divisors is an integer number (824944788).

Almost surely, 2^21436569265 is an apocalyptic number.

It is an amenable number.

21436569265 is a deficient number, since it is larger than the sum of its proper divisors (4961663951).

21436569265 is a wasteful number, since it uses less digits than its factorization.

21436569265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2209.

The product of its digits is 2332800, while the sum is 49.

The spelling of 21436569265 in words is "twenty-one billion, four hundred thirty-six million, five hundred sixty-nine thousand, two hundred sixty-five".