12201221201221 has 4 divisors (see below), whose sum is σ = 13139776678252. Its totient is φ = 11262665724192.

The previous prime is 12201221201201. The next prime is 12201221201231. The reversal of 12201221201221 is 12210212210221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3701891440900 + 8499329760321 = 1924030^2 + 2915361^2 .

It is a cyclic number.

It is not a de Polignac number, because 12201221201221 - 2²⁵ = 12201187646789 is a prime.

It is a super-2 number, since 2×12201221201221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12201221201201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469277738496 + ... + 469277738521.

It is an arithmetic number, because the mean of its divisors is an integer number (3284944169563).

Almost surely, 2^{12201221201221} is an apocalyptic number.

It is an amenable number.

12201221201221 is a deficient number, since it is larger than the sum of its proper divisors (938555477031).

12201221201221 is an equidigital number, since it uses as much as digits as its factorization.

12201221201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938555477030.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12201221201221 its reverse (12210212210221), we get a palindrome (24411433411442).

The spelling of 12201221201221 in words is "twelve trillion, two hundred one billion, two hundred twenty-one million, two hundred one thousand, two hundred twenty-one".