12001202121 has 4 divisors (see below), whose sum is σ = 16001602832. Its totient is φ = 8000801412.

The previous prime is 12001202113. The next prime is 12001202183. The reversal of 12001202121 is 12120210021.

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.

It is not a de Polignac number, because 12001202121 - 2³ = 12001202113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12001202097 and 12001202106.

It is not an unprimeable number, because it can be changed into a prime (12001202111) 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, 2000200351 + ... + 2000200356.

It is an arithmetic number, because the mean of its divisors is an integer number (4000400708).

Almost surely, 2^12001202121 is an apocalyptic number.

It is an amenable number.

12001202121 is a deficient number, since it is larger than the sum of its proper divisors (4000400711).

12001202121 is an equidigital number, since it uses as much as digits as its factorization.

12001202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4000400710.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12001202121 its reverse (12120210021), we get a palindrome (24121412142).

The spelling of 12001202121 in words is "twelve billion, one million, two hundred two thousand, one hundred twenty-one".