21752776674 has 12 divisors (see below), whose sum is σ = 47131016166. Its totient is φ = 7250925552.

The previous prime is 21752776673. The next prime is 21752776687. The reversal of 21752776674 is 47667725712.

It can be written as a sum of positive squares in only one way, i.e., 13284176049 + 8468600625 = 115257^2 + 92025^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21752776674.

It is not an unprimeable number, because it can be changed into a prime (21752776673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 604243779 + ... + 604243814.

Almost surely, 2^21752776674 is an apocalyptic number.

21752776674 is an abundant number, since it is smaller than the sum of its proper divisors (25378239492).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21752776674 is a wasteful number, since it uses less digits than its factorization.

21752776674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208487601 (or 1208487598 counting only the distinct ones).

The product of its digits is 6914880, while the sum is 54.

The spelling of 21752776674 in words is "twenty-one billion, seven hundred fifty-two million, seven hundred seventy-six thousand, six hundred seventy-four".