201221220221 has 8 divisors (see below), whose sum is σ = 230010273024. Its totient is φ = 172442958480.

The previous prime is 201221220191. The next prime is 201221220253. The reversal of 201221220221 is 122022122102.

It is a happy number.

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 201221220221 - 2³⁰ = 200147478397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201221220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221220121) 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, 2657765 + ... + 2732426.

It is an arithmetic number, because the mean of its divisors is an integer number (28751284128).

Almost surely, 2^201221220221 is an apocalyptic number.

It is an amenable number.

201221220221 is a deficient number, since it is larger than the sum of its proper divisors (28789052803).

201221220221 is an equidigital number, since it uses as much as digits as its factorization.

201221220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5395531.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 201221220221 its reverse (122022122102), we get a palindrome (323243342323).

The spelling of 201221220221 in words is "two hundred one billion, two hundred twenty-one million, two hundred twenty thousand, two hundred twenty-one".