221729166443 has 4 divisors (see below), whose sum is σ = 231369565008. Its totient is φ = 212088767880.

The previous prime is 221729166377. The next prime is 221729166479. The reversal of 221729166443 is 344661927122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221729166443 - 2²⁶ = 221662057579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221729166493) 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 3 ways as a sum of consecutive naturals, for example, 4820199248 + ... + 4820199293.

It is an arithmetic number, because the mean of its divisors is an integer number (57842391252).

Almost surely, 2^221729166443 is an apocalyptic number.

221729166443 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

221729166443 is a deficient number, since it is larger than the sum of its proper divisors (9640398565).

221729166443 is an equidigital number, since it uses as much as digits as its factorization.

221729166443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9640398564.

The product of its digits is 870912, while the sum is 47.

The spelling of 221729166443 in words is "two hundred twenty-one billion, seven hundred twenty-nine million, one hundred sixty-six thousand, four hundred forty-three".