21945735908 has 12 divisors (see below), whose sum is σ = 40426355760. Its totient is φ = 10395348552.

The previous prime is 21945735883. The next prime is 21945735923. The reversal of 21945735908 is 80953754912.

It is a self number, because there is not a number n which added to its sum of digits gives 21945735908.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144379766 + ... + 144379917.

It is an arithmetic number, because the mean of its divisors is an integer number (3368862980).

Almost surely, 2^21945735908 is an apocalyptic number.

It is an amenable number.

21945735908 is a deficient number, since it is larger than the sum of its proper divisors (18480619852).

21945735908 is a wasteful number, since it uses less digits than its factorization.

21945735908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288759706 (or 288759704 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 53.

The spelling of 21945735908 in words is "twenty-one billion, nine hundred forty-five million, seven hundred thirty-five thousand, nine hundred eight".