12121122120211 has 4 divisors (see below), whose sum is σ = 13053516129472. Its totient is φ = 11188728110952.

The previous prime is 12121122120139. The next prime is 12121122120223. The reversal of 12121122120211 is 11202122112121.

It is a happy number.

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 12121122120211 - 2¹¹ = 12121122118163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12121122100211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466197004611 + ... + 466197004636.

It is an arithmetic number, because the mean of its divisors is an integer number (3263379032368).

Almost surely, 2^{12121122120211} is an apocalyptic number.

12121122120211 is a deficient number, since it is larger than the sum of its proper divisors (932394009261).

12121122120211 is an equidigital number, since it uses as much as digits as its factorization.

12121122120211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932394009260.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 12121122120211 its reverse (11202122112121), we get a palindrome (23323244232332).

The spelling of 12121122120211 in words is "twelve trillion, one hundred twenty-one billion, one hundred twenty-two million, one hundred twenty thousand, two hundred eleven".