218422071890 has 48 divisors (see below), whose sum is σ = 457571453976. Its totient is φ = 74754071040.

The previous prime is 218422071869. The next prime is 218422071947. The reversal of 218422071890 is 98170224812.

218422071890 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 4 ways, for example, as 211628520961 + 6793550929 = 460031^2 + 82423^2 .

It is a Curzon number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 5288669 + ... + 5329808.

Almost surely, 2^218422071890 is an apocalyptic number.

218422071890 is an abundant number, since it is smaller than the sum of its proper divisors (239149382086).

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

218422071890 is a wasteful number, since it uses less digits than its factorization.

218422071890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10618523 (or 10618512 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 44.

The spelling of 218422071890 in words is "two hundred eighteen billion, four hundred twenty-two million, seventy-one thousand, eight hundred ninety".