221943097872 has 40 divisors (see below), whose sum is σ = 637058893280. Its totient is φ = 73981032480.

The previous prime is 221943097847. The next prime is 221943097921. The reversal of 221943097872 is 278790349122.

It is a happy number.

221943097872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 7 ways as a sum of consecutive naturals, for example, 256878154 + ... + 256879017.

It is an arithmetic number, because the mean of its divisors is an integer number (15926472332).

Almost surely, 2^221943097872 is an apocalyptic number.

It is an amenable number.

221943097872 is an abundant number, since it is smaller than the sum of its proper divisors (415115795408).

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

221943097872 is a wasteful number, since it uses less digits than its factorization.

221943097872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513757188 (or 513757176 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 221943097872 in words is "two hundred twenty-one billion, nine hundred forty-three million, ninety-seven thousand, eight hundred seventy-two".