221973676165 has 32 divisors (see below), whose sum is σ = 274695757056. Its totient is φ = 172068572160.

The previous prime is 221973676163. The next prime is 221973676193. The reversal of 221973676165 is 561676379122.

It is a happy number.

It is not a de Polignac number, because 221973676165 - 2¹ = 221973676163 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221973676163) 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 31 ways as a sum of consecutive naturals, for example, 48665485 + ... + 48670045.

It is an arithmetic number, because the mean of its divisors is an integer number (8584242408).

Almost surely, 2^221973676165 is an apocalyptic number.

It is an amenable number.

221973676165 is a deficient number, since it is larger than the sum of its proper divisors (52722080891).

221973676165 is a wasteful number, since it uses less digits than its factorization.

221973676165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5629.

The product of its digits is 5715360, while the sum is 55.

The spelling of 221973676165 in words is "two hundred twenty-one billion, nine hundred seventy-three million, six hundred seventy-six thousand, one hundred sixty-five".