221943866688 has 84 divisors (see below), whose sum is σ = 640805766900. Its totient is φ = 73441253376.

The previous prime is 221943866633. The next prime is 221943866699. The reversal of 221943866688 is 886668349122.

It can be written as a sum of positive squares in 2 ways, for example, as 99785228544 + 122158638144 = 315888^2 + 349512^2 .

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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, 1327363 + ... + 1485186.

Almost surely, 2^221943866688 is an apocalyptic number.

It is an amenable number.

221943866688 is an abundant number, since it is smaller than the sum of its proper divisors (418861900212).

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

221943866688 is a wasteful number, since it uses less digits than its factorization.

221943866688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2812704 (or 2812691 counting only the distinct ones).

The product of its digits is 47775744, while the sum is 63.

The spelling of 221943866688 in words is "two hundred twenty-one billion, nine hundred forty-three million, eight hundred sixty-six thousand, six hundred eighty-eight".