221424713728 has 136 divisors (see below), whose sum is σ = 452142521600. Its totient is φ = 108419088384.

The previous prime is 221424713717. The next prime is 221424713743. The reversal of 221424713728 is 827317424122.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 992935825 + ... + 992936047.

Almost surely, 2^221424713728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221424713728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226071260800).

221424713728 is an abundant number, since it is smaller than the sum of its proper divisors (230717807872).

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

221424713728 is an equidigital number, since it uses as much as digits as its factorization.

221424713728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503 (or 473 counting only the distinct ones).

The product of its digits is 301056, while the sum is 43.

The spelling of 221424713728 in words is "two hundred twenty-one billion, four hundred twenty-four million, seven hundred thirteen thousand, seven hundred twenty-eight".