221840608418 has 162 divisors, whose sum is σ = 423823452633. Its totient is φ = 86965232640.

The previous prime is 221840608417. The next prime is 221840608439. The reversal of 221840608418 is 814806048122.

221840608418 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 14 ways, for example, as 11854249 + 221828754169 = 3443^2 + 470987^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=333047.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221840608417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 1619274446 + ... + 1619274582.

Almost surely, 2^221840608418 is an apocalyptic number.

221840608418 is a deficient number, since it is larger than the sum of its proper divisors (201982844215).

221840608418 is a wasteful number, since it uses less digits than its factorization.

221840608418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 44.

The spelling of 221840608418 in words is "two hundred twenty-one billion, eight hundred forty million, six hundred eight thousand, four hundred eighteen".