221111222011 has 4 divisors (see below), whose sum is σ = 221461636624. Its totient is φ = 220760807400.

The previous prime is 221111221999. The next prime is 221111222047. The reversal of 221111222011 is 110222111122.

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 221111222011 - 2¹¹ = 221111219963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221111222051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175206360 + ... + 175207621.

It is an arithmetic number, because the mean of its divisors is an integer number (55365409156).

Almost surely, 2^221111222011 is an apocalyptic number.

221111222011 is a deficient number, since it is larger than the sum of its proper divisors (350414613).

221111222011 is an equidigital number, since it uses as much as digits as its factorization.

221111222011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350414612.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221111222011 its reverse (110222111122), we get a palindrome (331333333133).

The spelling of 221111222011 in words is "two hundred twenty-one billion, one hundred eleven million, two hundred twenty-two thousand, eleven".