21788416882 has 16 divisors (see below), whose sum is σ = 34028618904. Its totient is φ = 10454256000.

The previous prime is 21788416823. The next prime is 21788416889. The reversal of 21788416882 is 28861488712.

It is a happy number.

It is a Cunningham number, because it is equal to 147609²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1049824801 + 20738592081 = 32401^2 + 144009^2 .

It is a super-2 number, since 2×21788416882² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21788416889) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2172969 + ... + 2182972.

Almost surely, 2^21788416882 is an apocalyptic number.

21788416882 is a deficient number, since it is larger than the sum of its proper divisors (12240202022).

21788416882 is a wasteful number, since it uses less digits than its factorization.

21788416882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4356045.

The product of its digits is 2752512, while the sum is 55.

The spelling of 21788416882 in words is "twenty-one billion, seven hundred eighty-eight million, four hundred sixteen thousand, eight hundred eighty-two".