221254257668 has 24 divisors (see below), whose sum is σ = 388261113240. Its totient is φ = 110322616320.

The previous prime is 221254257641. The next prime is 221254257673. The reversal of 221254257668 is 866752452122.

It can be written as a sum of positive squares in 4 ways, for example, as 2980286464 + 218273971204 = 54592^2 + 467198^2 .

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, 12241358 + ... + 12259418.

It is an arithmetic number, because the mean of its divisors is an integer number (16177546385).

Almost surely, 2^221254257668 is an apocalyptic number.

It is an amenable number.

221254257668 is a deficient number, since it is larger than the sum of its proper divisors (167006855572).

221254257668 is a wasteful number, since it uses less digits than its factorization.

221254257668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26327 (or 26325 counting only the distinct ones).

The product of its digits is 3225600, while the sum is 50.

The spelling of 221254257668 in words is "two hundred twenty-one billion, two hundred fifty-four million, two hundred fifty-seven thousand, six hundred sixty-eight".