21735866912 has 24 divisors (see below), whose sum is σ = 42795772236. Its totient is φ = 10867099392.

The previous prime is 21735866899. The next prime is 21735866947. The reversal of 21735866912 is 21966853712.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18353746576 + 3382120336 = 135476^2 + 58156^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 808958 + ... + 835394.

Almost surely, 2^21735866912 is an apocalyptic number.

It is an amenable number.

21735866912 is a deficient number, since it is larger than the sum of its proper divisors (21059905324).

21735866912 is a wasteful number, since it uses less digits than its factorization.

21735866912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52140 (or 52132 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 50.

The spelling of 21735866912 in words is "twenty-one billion, seven hundred thirty-five million, eight hundred sixty-six thousand, nine hundred twelve".