221201111220211 has 4 divisors (see below), whose sum is σ = 228336630937024. Its totient is φ = 214065591503400.

The previous prime is 221201111220139. The next prime is 221201111220247. The reversal of 221201111220211 is 112022111102122.

It is a happy number.

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

It is not a de Polignac number, because 221201111220211 - 2²³ = 221201102831603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221201111220811) 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, 3567759858360 + ... + 3567759858421.

It is an arithmetic number, because the mean of its divisors is an integer number (57084157734256).

Almost surely, 2^{221201111220211} is an apocalyptic number.

221201111220211 is a deficient number, since it is larger than the sum of its proper divisors (7135519716813).

221201111220211 is an equidigital number, since it uses as much as digits as its factorization.

221201111220211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7135519716812.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221201111220211 its reverse (112022111102122), we get a palindrome (333223222322333).

The spelling of 221201111220211 in words is "two hundred twenty-one trillion, two hundred one billion, one hundred eleven million, two hundred twenty thousand, two hundred eleven".