221189646729 has 8 divisors (see below), whose sum is σ = 295654990752. Its totient is φ = 147092033600.

The previous prime is 221189646673. The next prime is 221189646761. The reversal of 221189646729 is 927646981122.

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 221189646729 - 2¹⁵ = 221189613961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221189646329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91931319 + ... + 91933724.

It is an arithmetic number, because the mean of its divisors is an integer number (36956873844).

Almost surely, 2^221189646729 is an apocalyptic number.

It is an amenable number.

221189646729 is a deficient number, since it is larger than the sum of its proper divisors (74465344023).

221189646729 is a wasteful number, since it uses less digits than its factorization.

221189646729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183865447.

The product of its digits is 5225472, while the sum is 57.

The spelling of 221189646729 in words is "two hundred twenty-one billion, one hundred eighty-nine million, six hundred forty-six thousand, seven hundred twenty-nine".