221405645416 has 8 divisors (see below), whose sum is σ = 415135585170. Its totient is φ = 110702822704.

The previous prime is 221405645399. The next prime is 221405645459. The reversal of 221405645416 is 614546504122.

It can be written as a sum of positive squares in only one way, i.e., 209773160100 + 11632485316 = 458010^2 + 107854^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13837852831 + ... + 13837852846.

Almost surely, 2^221405645416 is an apocalyptic number.

It is an amenable number.

221405645416 is a deficient number, since it is larger than the sum of its proper divisors (193729939754).

221405645416 is a wasteful number, since it uses less digits than its factorization.

221405645416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27675705683 (or 27675705679 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 40.

The spelling of 221405645416 in words is "two hundred twenty-one billion, four hundred five million, six hundred forty-five thousand, four hundred sixteen".