12201001221121 has 4 divisors (see below), whose sum is σ = 12401017634644. Its totient is φ = 12000984807600.

The previous prime is 12201001221113. The next prime is 12201001221137. The reversal of 12201001221121 is 12112210010221.

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 428972601600 + 11772028619521 = 654960^2 + 3431039^2 .

It is a cyclic number.

It is not a de Polignac number, because 12201001221121 - 2³ = 12201001221113 is a prime.

It is a super-2 number, since 2×12201001221121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12201001221095 and 12201001221104.

It is not an unprimeable number, because it can be changed into a prime (12201001224121) 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, 100008206670 + ... + 100008206791.

It is an arithmetic number, because the mean of its divisors is an integer number (3100254408661).

Almost surely, 2^{12201001221121} is an apocalyptic number.

It is an amenable number.

12201001221121 is a deficient number, since it is larger than the sum of its proper divisors (200016413523).

12201001221121 is an equidigital number, since it uses as much as digits as its factorization.

12201001221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200016413522.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 12201001221121 its reverse (12112210010221), we get a palindrome (24313211231342).

The spelling of 12201001221121 in words is "twelve trillion, two hundred one billion, one million, two hundred twenty-one thousand, one hundred twenty-one".