221668533355 has 4 divisors (see below), whose sum is σ = 266002240032. Its totient is φ = 177334826680.

The previous prime is 221668533277. The next prime is 221668533371. The reversal of 221668533355 is 553335866122.

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

It is not a de Polignac number, because 221668533355 - 2²⁵ = 221634978923 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221668533299 and 221668533308.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22166853331 + ... + 22166853340.

It is an arithmetic number, because the mean of its divisors is an integer number (66500560008).

Almost surely, 2^221668533355 is an apocalyptic number.

221668533355 is a deficient number, since it is larger than the sum of its proper divisors (44333706677).

221668533355 is an equidigital number, since it uses as much as digits as its factorization.

221668533355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44333706676.

The product of its digits is 3888000, while the sum is 49.

The spelling of 221668533355 in words is "two hundred twenty-one billion, six hundred sixty-eight million, five hundred thirty-three thousand, three hundred fifty-five".