221787444318864 has 40 divisors (see below), whose sum is σ = 574204619757600. Its totient is φ = 73767377534208.

The previous prime is 221787444318859. The next prime is 221787444318871. The reversal of 221787444318864 is 468813444787122.

It is a happy number.

221787444318864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5055308214 + ... + 5055352085.

It is an arithmetic number, because the mean of its divisors is an integer number (14355115493940).

Almost surely, 2^{221787444318864} is an apocalyptic number.

221787444318864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221787444318864 is an abundant number, since it is smaller than the sum of its proper divisors (352417175438736).

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

221787444318864 is a wasteful number, since it uses less digits than its factorization.

221787444318864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10110660767 (or 10110660761 counting only the distinct ones).

The product of its digits is 462422016, while the sum is 69.

The spelling of 221787444318864 in words is "two hundred twenty-one trillion, seven hundred eighty-seven billion, four hundred forty-four million, three hundred eighteen thousand, eight hundred sixty-four".