221393171616 has 48 divisors (see below), whose sum is σ = 590684256288. Its totient is φ = 72587923200.

The previous prime is 221393171599. The next prime is 221393171617. The reversal of 221393171616 is 616171393122.

221393171616 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (221393171617) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 18897250 + ... + 18908961.

It is an arithmetic number, because the mean of its divisors is an integer number (12305922006).

Almost surely, 2^221393171616 is an apocalyptic number.

It is an amenable number.

221393171616 is an abundant number, since it is smaller than the sum of its proper divisors (369291084672).

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

221393171616 is a wasteful number, since it uses less digits than its factorization.

221393171616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37806285 (or 37806277 counting only the distinct ones).

The product of its digits is 81648, while the sum is 42.

The spelling of 221393171616 in words is "two hundred twenty-one billion, three hundred ninety-three million, one hundred seventy-one thousand, six hundred sixteen".