12201202021221 has 12 divisors (see below), whose sum is σ = 17635622266080. Its totient is φ = 8128751392680.

The previous prime is 12201202021187. The next prime is 12201202021243. The reversal of 12201202021221 is 12212020210221.

It is a happy number.

12201202021221 is a `hidden beast` number, since 1 + 220 + 1 + 20 + 202 + 1 + 221 = 666.

It is not a de Polignac number, because 12201202021221 - 2¹⁰ = 12201202020197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12201202021194 and 12201202021203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12201202021271) 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 11 ways as a sum of consecutive naturals, for example, 448592991 + ... + 448620188.

It is an arithmetic number, because the mean of its divisors is an integer number (1469635188840).

Almost surely, 2^{12201202021221} is an apocalyptic number.

It is an amenable number.

12201202021221 is a deficient number, since it is larger than the sum of its proper divisors (5434420244859).

12201202021221 is a wasteful number, since it uses less digits than its factorization.

12201202021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897214696 (or 897214693 counting only the distinct ones).

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

Adding to 12201202021221 its reverse (12212020210221), we get a palindrome (24413222231442).

The spelling of 12201202021221 in words is "twelve trillion, two hundred one billion, two hundred two million, twenty-one thousand, two hundred twenty-one".