221011221211 has 8 divisors (see below), whose sum is σ = 241619436864. Its totient is φ = 200489053320.

The previous prime is 221011221209. The next prime is 221011221239. The reversal of 221011221211 is 112122110122.

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 221011221211 - 2¹ = 221011221209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221011221281) 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 7 ways as a sum of consecutive naturals, for example, 21506565 + ... + 21516838.

It is an arithmetic number, because the mean of its divisors is an integer number (30202429608).

Almost surely, 2^221011221211 is an apocalyptic number.

221011221211 is a deficient number, since it is larger than the sum of its proper divisors (20608215653).

221011221211 is a wasteful number, since it uses less digits than its factorization.

221011221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43023881.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221011221211 its reverse (112122110122), we get a palindrome (333133331333).

The spelling of 221011221211 in words is "two hundred twenty-one billion, eleven million, two hundred twenty-one thousand, two hundred eleven".