221728075790 has 48 divisors (see below), whose sum is σ = 430501847328. Its totient is φ = 81737500992.

The previous prime is 221728075769. The next prime is 221728075801. The reversal of 221728075790 is 97570827122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91508519 + ... + 91510941.

It is an arithmetic number, because the mean of its divisors is an integer number (8968788486).

Almost surely, 2^221728075790 is an apocalyptic number.

221728075790 is a deficient number, since it is larger than the sum of its proper divisors (208773771538).

221728075790 is an equidigital number, since it uses as much as digits as its factorization.

221728075790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4121 (or 3282 counting only the distinct ones).

The product of its (nonzero) digits is 987840, while the sum is 50.

The spelling of 221728075790 in words is "two hundred twenty-one billion, seven hundred twenty-eight million, seventy-five thousand, seven hundred ninety".