221873735640 has 64 divisors (see below), whose sum is σ = 665803749600. Its totient is φ = 59150103552.

The previous prime is 221873735623. The next prime is 221873735651. The reversal of 221873735640 is 46537378122.

221873735640 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 221873735640.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 189066 + ... + 692454.

Almost surely, 2^221873735640 is an apocalyptic number.

221873735640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221873735640 is an abundant number, since it is smaller than the sum of its proper divisors (443930013960).

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

221873735640 is a wasteful number, since it uses less digits than its factorization.

221873735640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507076 (or 507072 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 48.

The spelling of 221873735640 in words is "two hundred twenty-one billion, eight hundred seventy-three million, seven hundred thirty-five thousand, six hundred forty".