12121201211 has 4 divisors (see below), whose sum is σ = 13852801392. Its totient is φ = 10389601032.

The previous prime is 12121201207. The next prime is 12121201219. The reversal of 12121201211 is 11210212121.

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

It is a cyclic number.

It is not a de Polignac number, because 12121201211 - 2² = 12121201207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12121201219) 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, 865800080 + ... + 865800093.

It is an arithmetic number, because the mean of its divisors is an integer number (3463200348).

Almost surely, 2^12121201211 is an apocalyptic number.

12121201211 is a deficient number, since it is larger than the sum of its proper divisors (1731600181).

12121201211 is an equidigital number, since it uses as much as digits as its factorization.

12121201211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731600180.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12121201211 its reverse (11210212121), we get a palindrome (23331413332).

The spelling of 12121201211 in words is "twelve billion, one hundred twenty-one million, two hundred one thousand, two hundred eleven".