21865844696 has 16 divisors (see below), whose sum is σ = 41492417400. Its totient is φ = 10801200064.

The previous prime is 21865844657. The next prime is 21865844701. The reversal of 21865844696 is 69644856812.

It is a happy number.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 16464581 + ... + 16465908.

Almost surely, 2^21865844696 is an apocalyptic number.

It is an amenable number.

21865844696 is a deficient number, since it is larger than the sum of its proper divisors (19626572704).

21865844696 is a wasteful number, since it uses less digits than its factorization.

21865844696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32930578 (or 32930574 counting only the distinct ones).

The product of its digits is 19906560, while the sum is 59.

The spelling of 21865844696 in words is "twenty-one billion, eight hundred sixty-five million, eight hundred forty-four thousand, six hundred ninety-six".