222011221121 has 4 divisors (see below), whose sum is σ = 229666780500. Its totient is φ = 214355661744.

The previous prime is 222011221099. The next prime is 222011221129. The reversal of 222011221121 is 121122110222.

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

It can be written as a sum of positive squares in 2 ways, for example, as 35132254096 + 186878967025 = 187436^2 + 432295^2 .

It is a cyclic number.

It is not a de Polignac number, because 222011221121 - 2¹⁰ = 222011220097 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 222011221121.

It is not an unprimeable number, because it can be changed into a prime (222011221129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3827779646 + ... + 3827779703.

It is an arithmetic number, because the mean of its divisors is an integer number (57416695125).

Almost surely, 2^222011221121 is an apocalyptic number.

It is an amenable number.

222011221121 is a deficient number, since it is larger than the sum of its proper divisors (7655559379).

222011221121 is an equidigital number, since it uses as much as digits as its factorization.

222011221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7655559378.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 222011221121 its reverse (121122110222), we get a palindrome (343133331343).

The spelling of 222011221121 in words is "two hundred twenty-two billion, eleven million, two hundred twenty-one thousand, one hundred twenty-one".