221220102166 has 8 divisors (see below), whose sum is σ = 379234460880. Its totient is φ = 94808615208.

The previous prime is 221220102161. The next prime is 221220102167. The reversal of 221220102166 is 661201022122.

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

It is a self number, because there is not a number n which added to its sum of digits gives 221220102166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221220102161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7900717921 + ... + 7900717948.

It is an arithmetic number, because the mean of its divisors is an integer number (47404307610).

Almost surely, 2^221220102166 is an apocalyptic number.

221220102166 is a deficient number, since it is larger than the sum of its proper divisors (158014358714).

221220102166 is a wasteful number, since it uses less digits than its factorization.

221220102166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15801435878.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 221220102166 its reverse (661201022122), we get a palindrome (882421124288).

The spelling of 221220102166 in words is "two hundred twenty-one billion, two hundred twenty million, one hundred two thousand, one hundred sixty-six".