201121221000221 has 12 divisors (see below), whose sum is σ = 208507479546912. Its totient is φ = 193988461426704.

The previous prime is 201121221000209. The next prime is 201121221000223. The reversal of 201121221000221 is 122000122121102.

It is not a de Polignac number, because 201121221000221 - 2⁴⁶ = 130752476822557 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 201121221000221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121221000223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120813851 + ... + 122467256.

It is an arithmetic number, because the mean of its divisors is an integer number (17375623295576).

Almost surely, 2^{201121221000221} is an apocalyptic number.

It is an amenable number.

201121221000221 is a deficient number, since it is larger than the sum of its proper divisors (7386258546691).

201121221000221 is an equidigital number, since it uses as much as digits as its factorization.

201121221000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243282148 (or 243282119 counting only the distinct ones).

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

Adding to 201121221000221 its reverse (122000122121102), we get a palindrome (323121343121323).

The spelling of 201121221000221 in words is "two hundred one trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-one", and thus it is an aban number.