221307885951688 has 32 divisors (see below), whose sum is σ = 423784054431360. Its totient is φ = 108298838061760.

The previous prime is 221307885951673. The next prime is 221307885951731. The reversal of 221307885951688 is 886159588703122.

It is a self number, because there is not a number n which added to its sum of digits gives 221307885951688.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53115318 + ... + 57130138.

It is an arithmetic number, because the mean of its divisors is an integer number (13243251700980).

Almost surely, 2^{221307885951688} is an apocalyptic number.

It is an amenable number.

221307885951688 is a deficient number, since it is larger than the sum of its proper divisors (202476168479672).

221307885951688 is a wasteful number, since it uses less digits than its factorization.

221307885951688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4161477 (or 4161473 counting only the distinct ones).

The product of its (nonzero) digits is 464486400, while the sum is 73.

The spelling of 221307885951688 in words is "two hundred twenty-one trillion, three hundred seven billion, eight hundred eighty-five million, nine hundred fifty-one thousand, six hundred eighty-eight".