21916607605 has 16 divisors (see below), whose sum is σ = 26972971200. Its totient is φ = 17085594240.

The previous prime is 21916607591. The next prime is 21916607617. The reversal of 21916607605 is 50670661912.

It is not a de Polignac number, because 21916607605 - 2¹⁵ = 21916574837 is a prime.

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 in 15 ways as a sum of consecutive naturals, for example, 113866 + ... + 238324.

It is an arithmetic number, because the mean of its divisors is an integer number (1685810700).

Almost surely, 2^21916607605 is an apocalyptic number.

It is an amenable number.

21916607605 is a deficient number, since it is larger than the sum of its proper divisors (5056363595).

21916607605 is a wasteful number, since it uses less digits than its factorization.

21916607605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125364.

The product of its (nonzero) digits is 136080, while the sum is 43.

The spelling of 21916607605 in words is "twenty-one billion, nine hundred sixteen million, six hundred seven thousand, six hundred five".