221568733767728 has 40 divisors (see below), whose sum is σ = 435710387899200. Its totient is φ = 109127447035200.

The previous prime is 221568733767727. The next prime is 221568733767737. The reversal of 221568733767728 is 827767337865122.

221568733767728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221568733767727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31134323 + ... + 37583021.

It is an arithmetic number, because the mean of its divisors is an integer number (10892759697480).

Almost surely, 2^{221568733767728} is an apocalyptic number.

It is an amenable number.

221568733767728 is a deficient number, since it is larger than the sum of its proper divisors (214141654131472).

221568733767728 is a wasteful number, since it uses less digits than its factorization.

221568733767728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6480825 (or 6480819 counting only the distinct ones).

The product of its digits is 1991485440, while the sum is 74.

The spelling of 221568733767728 in words is "two hundred twenty-one trillion, five hundred sixty-eight billion, seven hundred thirty-three million, seven hundred sixty-seven thousand, seven hundred twenty-eight".