21774421608 has 32 divisors (see below), whose sum is σ = 54833405760. Its totient is φ = 7205160320.

The previous prime is 21774421601. The next prime is 21774421639. The reversal of 21774421608 is 80612447712.

It is a self number, because there is not a number n which added to its sum of digits gives 21774421608.

It is not an unprimeable number, because it can be changed into a prime (21774421601) 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, 3307908 + ... + 3314483.

It is an arithmetic number, because the mean of its divisors is an integer number (1713543930).

Almost surely, 2^21774421608 is an apocalyptic number.

It is an amenable number.

21774421608 is an abundant number, since it is smaller than the sum of its proper divisors (33058984152).

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

21774421608 is a wasteful number, since it uses less digits than its factorization.

21774421608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6622537 (or 6622533 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 42.

The spelling of 21774421608 in words is "twenty-one billion, seven hundred seventy-four million, four hundred twenty-one thousand, six hundred eight".