21903942616 has 8 divisors (see below), whose sum is σ = 41069892420. Its totient is φ = 10951971304.

The previous prime is 21903942607. The next prime is 21903942629. The reversal of 21903942616 is 61624930912.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1368996406 + ... + 1368996421.

Almost surely, 2^21903942616 is an apocalyptic number.

It is an amenable number.

21903942616 is a deficient number, since it is larger than the sum of its proper divisors (19165949804).

21903942616 is a wasteful number, since it uses less digits than its factorization.

21903942616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2737992833 (or 2737992829 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 43.

The spelling of 21903942616 in words is "twenty-one billion, nine hundred three million, nine hundred forty-two thousand, six hundred sixteen".