211221112211 has 8 divisors (see below), whose sum is σ = 211342267584. Its totient is φ = 211099996800.

The previous prime is 211221112169. The next prime is 211221112243. The reversal of 211221112211 is 112211122112.

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 211221112211 - 2²² = 211216917907 is a prime.

It is a super-2 number, since 2×211221112211² (a number of 23 digits) contains 22 as substring.

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 211221112211.

It is not an unprimeable number, because it can be changed into a prime (211221142211) 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, 21328361 + ... + 21338261.

It is an arithmetic number, because the mean of its divisors is an integer number (26417783448).

Almost surely, 2^211221112211 is an apocalyptic number.

211221112211 is a deficient number, since it is larger than the sum of its proper divisors (121155373).

211221112211 is an equidigital number, since it uses as much as digits as its factorization.

211221112211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19981.

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

Adding to 211221112211 its reverse (112211122112), we get a palindrome (323432234323).

Subtracting from 211221112211 its reverse (112211122112), we obtain a palindrome (99009990099).

It can be divided in two parts, 2 and 11221112211, that multiplied together give a palindrome (22442224422).

The spelling of 211221112211 in words is "two hundred eleven billion, two hundred twenty-one million, one hundred twelve thousand, two hundred eleven".