20111120211211 has 2 divisors, whose sum is σ = 20111120211212. Its totient is φ = 20111120211210.

The previous prime is 20111120211209. The next prime is 20111120211293. The reversal of 20111120211211 is 11211202111102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20111120211211 - 2¹ = 20111120211209 is a prime.

It is a super-2 number, since 2×20111120211211² (a number of 27 digits) contains 22 as substring.

Together with 20111120211209, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20111120211311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055560105605 + 10055560105606.

It is an arithmetic number, because the mean of its divisors is an integer number (10055560105606).

Almost surely, 2^{20111120211211} is an apocalyptic number.

20111120211211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111120211211 is an equidigital number, since it uses as much as digits as its factorization.

20111120211211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 20111120211211 its reverse (11211202111102), we get a palindrome (31322322322313).

The spelling of 20111120211211 in words is "twenty trillion, one hundred eleven billion, one hundred twenty million, two hundred eleven thousand, two hundred eleven".