221211112211 has 4 divisors (see below), whose sum is σ = 221218361832. Its totient is φ = 221203862592.

The previous prime is 221211112201. The next prime is 221211112217. The reversal of 221211112211 is 112211112122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 112211112122 = 2 ⋅56105556061.

It is a cyclic number.

It is not a de Polignac number, because 221211112211 - 2²² = 221206917907 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 221211112211.

It is not an unprimeable number, because it can be changed into a prime (221211112217) 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, 3578846 + ... + 3640131.

It is an arithmetic number, because the mean of its divisors is an integer number (55304590458).

Almost surely, 2^221211112211 is an apocalyptic number.

221211112211 is a deficient number, since it is larger than the sum of its proper divisors (7249621).

221211112211 is an equidigital number, since it uses as much as digits as its factorization.

221211112211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7249620.

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

Adding to 221211112211 its reverse (112211112122), we get a palindrome (333422224333).

The spelling of 221211112211 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred twelve thousand, two hundred eleven".