12121321211 has 2 divisors, whose sum is σ = 12121321212. Its totient is φ = 12121321210.

The previous prime is 12121321207. The next prime is 12121321229. The reversal of 12121321211 is 11212312121.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (11212312121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12121321211 - 2² = 12121321207 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12121321211.

It is not a weakly prime, because it can be changed into another prime (12121921211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060660605 + 6060660606.

It is an arithmetic number, because the mean of its divisors is an integer number (6060660606).

Almost surely, 2^12121321211 is an apocalyptic number.

12121321211 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121321211 is an equidigital number, since it uses as much as digits as its factorization.

12121321211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48, while the sum is 17.

Adding to 12121321211 its reverse (11212312121), we get a palindrome (23333633332).

The spelling of 12121321211 in words is "twelve billion, one hundred twenty-one million, three hundred twenty-one thousand, two hundred eleven".