201021202201221 has 24 divisors (see below), whose sum is σ = 291136130991680. Its totient is φ = 133657762283136.

The previous prime is 201021202201163. The next prime is 201021202201229. The reversal of 201021202201221 is 122102202120102.

It is a happy number.

201021202201221 is a `hidden beast` number, since 2 + 0 + 10 + 212 + 0 + 220 + 1 + 221 = 666.

It is not a de Polignac number, because 201021202201221 - 2⁷ = 201021202201093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201021202201194 and 201021202201203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021202201229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 170860845 + ... + 172033341.

Almost surely, 2^{201021202201221} is an apocalyptic number.

It is an amenable number.

201021202201221 is a deficient number, since it is larger than the sum of its proper divisors (90114928790459).

201021202201221 is a wasteful number, since it uses less digits than its factorization.

201021202201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223145 (or 1223142 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 201021202201221 its reverse (122102202120102), we get a palindrome (323123404321323).

The spelling of 201021202201221 in words is "two hundred one trillion, twenty-one billion, two hundred two million, two hundred one thousand, two hundred twenty-one".