21775436216 has 16 divisors (see below), whose sum is σ = 40844314800. Its totient is φ = 10883618944.

The previous prime is 21775436167. The next prime is 21775436251. The reversal of 21775436216 is 61263457712.

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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 489761 + ... + 532368.

It is an arithmetic number, because the mean of its divisors is an integer number (2552769675).

Almost surely, 2^21775436216 is an apocalyptic number.

It is an amenable number.

21775436216 is a deficient number, since it is larger than the sum of its proper divisors (19068878584).

21775436216 is a wasteful number, since it uses less digits than its factorization.

21775436216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024798 (or 1024794 counting only the distinct ones).

The product of its digits is 423360, while the sum is 44.

The spelling of 21775436216 in words is "twenty-one billion, seven hundred seventy-five million, four hundred thirty-six thousand, two hundred sixteen".