221112211211 has 8 divisors (see below), whose sum is σ = 221443495824. Its totient is φ = 220781008800.

The previous prime is 221112211207. The next prime is 221112211247. The reversal of 221112211211 is 112112211122.

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 221112211211 - 2² = 221112211207 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 221112211211.

It is not an unprimeable number, because it can be changed into a prime (221112211291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7242200 + ... + 7272666.

It is an arithmetic number, because the mean of its divisors is an integer number (27680436978).

Almost surely, 2^221112211211 is an apocalyptic number.

221112211211 is a deficient number, since it is larger than the sum of its proper divisors (331284613).

221112211211 is an equidigital number, since it uses as much as digits as its factorization.

221112211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41101.

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

Adding to 221112211211 its reverse (112112211122), we get a palindrome (333224422333).

It can be divided in two parts, 2211122 and 11211, that multiplied together give a palindrome (24788888742).

The spelling of 221112211211 in words is "two hundred twenty-one billion, one hundred twelve million, two hundred eleven thousand, two hundred eleven".