21465005836 has 12 divisors (see below), whose sum is σ = 37575067320. Its totient is φ = 10729272320.

The previous prime is 21465005827. The next prime is 21465005839. The reversal of 21465005836 is 63850056412.

It is not an unprimeable number, because it can be changed into a prime (21465005839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 792670 + ... + 819301.

It is an arithmetic number, because the mean of its divisors is an integer number (3131255610).

Almost surely, 2^21465005836 is an apocalyptic number.

It is an amenable number.

21465005836 is a deficient number, since it is larger than the sum of its proper divisors (16110061484).

21465005836 is a wasteful number, since it uses less digits than its factorization.

21465005836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615304 (or 1615302 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 21465005836 in words is "twenty-one billion, four hundred sixty-five million, five thousand, eight hundred thirty-six".