201221002221 has 16 divisors (see below), whose sum is σ = 289613439360. Its totient is φ = 123890191040.

The previous prime is 201221002219. The next prime is 201221002249. The reversal of 201221002221 is 122200122102.

It is a cyclic number.

It is not a de Polignac number, because 201221002221 - 2¹ = 201221002219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201221002221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221002261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50278110 + ... + 50282111.

It is an arithmetic number, because the mean of its divisors is an integer number (18100839960).

Almost surely, 2^201221002221 is an apocalyptic number.

It is an amenable number.

201221002221 is a deficient number, since it is larger than the sum of its proper divisors (88392437139).

201221002221 is a wasteful number, since it uses less digits than its factorization.

201221002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100560276.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 201221002221 its reverse (122200122102), we get a palindrome (323421124323).

The spelling of 201221002221 in words is "two hundred one billion, two hundred twenty-one million, two thousand, two hundred twenty-one".