221021221101211 has 4 divisors (see below), whose sum is σ = 221201941642992. Its totient is φ = 220840500559432.

The previous prime is 221021221101209. The next prime is 221021221101217. The reversal of 221021221101211 is 112101122120122.

It is a happy number.

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 221021221101211 - 2¹ = 221021221101209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221021221101217) 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, 90360269056 + ... + 90360271501.

It is an arithmetic number, because the mean of its divisors is an integer number (55300485410748).

Almost surely, 2^{221021221101211} is an apocalyptic number.

221021221101211 is a deficient number, since it is larger than the sum of its proper divisors (180720541781).

221021221101211 is a wasteful number, since it uses less digits than its factorization.

221021221101211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180720541780.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221021221101211 its reverse (112101122120122), we get a palindrome (333122343221333).

The spelling of 221021221101211 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred twenty-one million, one hundred one thousand, two hundred eleven".