221272768784 has 20 divisors (see below), whose sum is σ = 428723363520. Its totient is φ = 110634481440.

The previous prime is 221272768771. The next prime is 221272768789. The reversal of 221272768784 is 487867272122.

It is not an unprimeable number, because it can be changed into a prime (221272768789) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1550189 + ... + 1686899.

It is an arithmetic number, because the mean of its divisors is an integer number (21436168176).

Almost surely, 2^221272768784 is an apocalyptic number.

It is an amenable number.

221272768784 is a deficient number, since it is larger than the sum of its proper divisors (207450594736).

221272768784 is a wasteful number, since it uses less digits than its factorization.

221272768784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237878 (or 237872 counting only the distinct ones).

The product of its digits is 8429568, while the sum is 56.

The spelling of 221272768784 in words is "two hundred twenty-one billion, two hundred seventy-two million, seven hundred sixty-eight thousand, seven hundred eighty-four".