20111201221211 has 2 divisors, whose sum is σ = 20111201221212. Its totient is φ = 20111201221210.

The previous prime is 20111201221201. The next prime is 20111201221247. The reversal of 20111201221211 is 11212210211102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20111201221211 - 2¹⁴ = 20111201204827 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20111201221211.

It is not a weakly prime, because it can be changed into another prime (20111201221201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055600610605 + 10055600610606.

It is an arithmetic number, because the mean of its divisors is an integer number (10055600610606).

Almost surely, 2^{20111201221211} is an apocalyptic number.

20111201221211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111201221211 is an equidigital number, since it uses as much as digits as its factorization.

20111201221211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20111201221211 its reverse (11212210211102), we get a palindrome (31323411432313).

The spelling of 20111201221211 in words is "twenty trillion, one hundred eleven billion, two hundred one million, two hundred twenty-one thousand, two hundred eleven".