12121212221211 has 8 divisors (see below), whose sum is σ = 16598416735504. Its totient is φ = 7862407927200.

The previous prime is 12121212221159. The next prime is 12121212221233. The reversal of 12121212221211 is 11212221212121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12121212221211 - 2²⁷ = 12121078003483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12121212221011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54600054940 + ... + 54600055161.

It is an arithmetic number, because the mean of its divisors is an integer number (2074802091938).

Almost surely, 2^{12121212221211} is an apocalyptic number.

12121212221211 is a deficient number, since it is larger than the sum of its proper divisors (4477204514293).

12121212221211 is a wasteful number, since it uses less digits than its factorization.

12121212221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109200110141.

The product of its digits is 128, while the sum is 21.

Adding to 12121212221211 its reverse (11212221212121), we get a palindrome (23333433433332).

The spelling of 12121212221211 in words is "twelve trillion, one hundred twenty-one billion, two hundred twelve million, two hundred twenty-one thousand, two hundred eleven".