221220211100111 has 8 divisors (see below), whose sum is σ = 233907610513920. Its totient is φ = 208637234727192.

The previous prime is 221220211100081. The next prime is 221220211100117. The reversal of 221220211100111 is 111001112022122.

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 221220211100111 - 2¹⁰ = 221220211099087 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 221220211100111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221220211100117) 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, 26105755865 + ... + 26105764338.

It is an arithmetic number, because the mean of its divisors is an integer number (29238451314240).

Almost surely, 2^{221220211100111} is an apocalyptic number.

221220211100111 is a deficient number, since it is larger than the sum of its proper divisors (12687399413809).

221220211100111 is a wasteful number, since it uses less digits than its factorization.

221220211100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52211520445.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221220211100111 its reverse (111001112022122), we get a palindrome (332221323122233).

The spelling of 221220211100111 in words is "two hundred twenty-one trillion, two hundred twenty billion, two hundred eleven million, one hundred thousand, one hundred eleven".