21775654422 has 24 divisors (see below), whose sum is σ = 47219210064. Its totient is φ = 7252609104.

The previous prime is 21775654391. The next prime is 21775654427. The reversal of 21775654422 is 22445657712.

21775654422 is a `hidden beast` number, since 2 + 17 + 75 + 6 + 544 + 22 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21775654427) 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 11 ways as a sum of consecutive naturals, for example, 472573 + ... + 516600.

It is an arithmetic number, because the mean of its divisors is an integer number (1967467086).

Almost surely, 2^21775654422 is an apocalyptic number.

21775654422 is an abundant number, since it is smaller than the sum of its proper divisors (25443555642).

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

21775654422 is a wasteful number, since it uses less digits than its factorization.

21775654422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990404 (or 990401 counting only the distinct ones).

The product of its digits is 940800, while the sum is 45.

The spelling of 21775654422 in words is "twenty-one billion, seven hundred seventy-five million, six hundred fifty-four thousand, four hundred twenty-two".