12122120201221 has 4 divisors (see below), whose sum is σ = 12122129165292. Its totient is φ = 12122111237152.

The previous prime is 12122120201197. The next prime is 12122120201287. The reversal of 12122120201221 is 12210202122121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4271538232900 + 7850581968321 = 2066770^2 + 2801889^2 .

It is a cyclic number.

It is not a de Polignac number, because 12122120201221 - 2³⁹ = 11572364387333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122120202221) 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, 1992736 + ... + 5311801.

It is an arithmetic number, because the mean of its divisors is an integer number (3030532291323).

Almost surely, 2^{12122120201221} is an apocalyptic number.

It is an amenable number.

12122120201221 is a deficient number, since it is larger than the sum of its proper divisors (8964071).

12122120201221 is an equidigital number, since it uses as much as digits as its factorization.

12122120201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8964070.

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

Adding to 12122120201221 its reverse (12210202122121), we get a palindrome (24332322323342).

The spelling of 12122120201221 in words is "twelve trillion, one hundred twenty-two billion, one hundred twenty million, two hundred one thousand, two hundred twenty-one".