12121122220111 has 2 divisors, whose sum is σ = 12121122220112. Its totient is φ = 12121122220110.

The previous prime is 12121122220057. The next prime is 12121122220127. The reversal of 12121122220111 is 11102222112121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12121122220111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12121122220171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060561110055 + 6060561110056.

It is an arithmetic number, because the mean of its divisors is an integer number (6060561110056).

Almost surely, 2^{12121122220111} is an apocalyptic number.

12121122220111 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121122220111 is an equidigital number, since it uses as much as digits as its factorization.

12121122220111 is an odious number, because the sum of its binary digits is odd.

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

Adding to 12121122220111 its reverse (11102222112121), we get a palindrome (23223344332232).

The spelling of 12121122220111 in words is "twelve trillion, one hundred twenty-one billion, one hundred twenty-two million, two hundred twenty thousand, one hundred eleven".