221312165165683 has 4 divisors (see below), whose sum is σ = 221312197764288. Its totient is φ = 221312132567080.

The previous prime is 221312165165681. The next prime is 221312165165687. The reversal of 221312165165683 is 386561561213122.

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 221312165165683 - 2¹ = 221312165165681 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221312165165683.

It is not an unprimeable number, because it can be changed into a prime (221312165165681) 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 3 ways as a sum of consecutive naturals, for example, 1840291 + ... + 21118972.

It is an arithmetic number, because the mean of its divisors is an integer number (55328049441072).

Almost surely, 2^{221312165165683} is an apocalyptic number.

221312165165683 is a deficient number, since it is larger than the sum of its proper divisors (32598605).

221312165165683 is an equidigital number, since it uses as much as digits as its factorization.

221312165165683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32598604.

The product of its digits is 3110400, while the sum is 52.

The spelling of 221312165165683 in words is "two hundred twenty-one trillion, three hundred twelve billion, one hundred sixty-five million, one hundred sixty-five thousand, six hundred eighty-three".