221170210656161 has 8 divisors (see below), whose sum is σ = 238459298353920. Its totient is φ = 203920550754192.

The previous prime is 221170210656127. The next prime is 221170210656229. The reversal of 221170210656161 is 161656012071122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221170210656161 - 2⁶ = 221170210656097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221170210256161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9856937291 + ... + 9856959728.

It is an arithmetic number, because the mean of its divisors is an integer number (29807412294240).

Almost surely, 2^{221170210656161} is an apocalyptic number.

It is an amenable number.

221170210656161 is a deficient number, since it is larger than the sum of its proper divisors (17289087697759).

221170210656161 is a wasteful number, since it uses less digits than its factorization.

221170210656161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19713897895.

The product of its (nonzero) digits is 60480, while the sum is 41.

The spelling of 221170210656161 in words is "two hundred twenty-one trillion, one hundred seventy billion, two hundred ten million, six hundred fifty-six thousand, one hundred sixty-one".