222121122211 has 4 divisors (see below), whose sum is σ = 222124320000. Its totient is φ = 222117924424.

The previous prime is 222121122193. The next prime is 222121122233. The reversal of 222121122211 is 112221121222.

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 222121122211 - 2¹¹ = 222121120163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222121122241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1492336 + ... + 1634413.

It is an arithmetic number, because the mean of its divisors is an integer number (55531080000).

Almost surely, 2^222121122211 is an apocalyptic number.

222121122211 is a deficient number, since it is larger than the sum of its proper divisors (3197789).

222121122211 is an equidigital number, since it uses as much as digits as its factorization.

222121122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3197788.

The product of its digits is 128, while the sum is 19.

Adding to 222121122211 its reverse (112221121222), we get a palindrome (334342243433).

It can be divided in two parts, 2221211 and 22211, that added together give a palindrome (2243422).

The spelling of 222121122211 in words is "two hundred twenty-two billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred eleven".