12021201121 has 4 divisors (see below), whose sum is σ = 12021587200. Its totient is φ = 12020815044.

The previous prime is 12021201097. The next prime is 12021201151. The reversal of 12021201121 is 12110212021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12110212021 = 17 ⋅712365413.

It is a cyclic number.

It is not a de Polignac number, because 12021201121 - 2²⁷ = 11886983393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021201151) 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, 141801 + ... + 210118.

It is an arithmetic number, because the mean of its divisors is an integer number (3005396800).

Almost surely, 2^12021201121 is an apocalyptic number.

It is an amenable number.

12021201121 is a deficient number, since it is larger than the sum of its proper divisors (386079).

12021201121 is an equidigital number, since it uses as much as digits as its factorization.

12021201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386078.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12021201121 its reverse (12110212021), we get a palindrome (24131413142).

The spelling of 12021201121 in words is "twelve billion, twenty-one million, two hundred one thousand, one hundred twenty-one".