201221210221 has 8 divisors (see below), whose sum is σ = 202628635704. Its totient is φ = 199818516480.

The previous prime is 201221210213. The next prime is 201221210227. The reversal of 201221210221 is 122012122102.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 98574021225 + 102647188996 = 313965^2 + 320386^2 .

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 201221210221 - 2³ = 201221210213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201221210195 and 201221210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221210227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1097566 + ... + 1267711.

It is an arithmetic number, because the mean of its divisors is an integer number (25328579463).

Almost surely, 2^201221210221 is an apocalyptic number.

It is an amenable number.

201221210221 is a deficient number, since it is larger than the sum of its proper divisors (1407425483).

201221210221 is a wasteful number, since it uses less digits than its factorization.

201221210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2365871.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 201221210221 its reverse (122012122102), we get a palindrome (323233332323).

The spelling of 201221210221 in words is "two hundred one billion, two hundred twenty-one million, two hundred ten thousand, two hundred twenty-one".