12121211201211 has 64 divisors (see below), whose sum is σ = 20780164060160. Its totient is φ = 6925035562848.

The previous prime is 12121211201159. The next prime is 12121211201221. The reversal of 12121211201211 is 11210211212121.

It is a happy number.

12121211201211 is a `hidden beast` number, since 1 + 21 + 21 + 211 + 201 + 211 = 666.

It is not a de Polignac number, because 12121211201211 - 2¹⁰ = 12121211200187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12121211201221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 79944405 + ... + 80095881.

It is an arithmetic number, because the mean of its divisors is an integer number (324690063440).

Almost surely, 2^{12121211201211} is an apocalyptic number.

12121211201211 is a deficient number, since it is larger than the sum of its proper divisors (8658952858949).

12121211201211 is an frugal number, since it uses more digits than its factorization.

12121211201211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156732 (or 156714 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 12121211201211 its reverse (11210211212121), we get a palindrome (23331422413332).

The spelling of 12121211201211 in words is "twelve trillion, one hundred twenty-one billion, two hundred eleven million, two hundred one thousand, two hundred eleven".