211211020111111 has 2 divisors, whose sum is σ = 211211020111112. Its totient is φ = 211211020111110.

The previous prime is 211211020111093. The next prime is 211211020111121. The reversal of 211211020111111 is 111111020112112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211211020111111 - 2⁵ = 211211020111079 is a prime.

It is a super-2 number, since 2×211211020111111² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211211020111121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105605510055555 + 105605510055556.

It is an arithmetic number, because the mean of its divisors is an integer number (105605510055556).

Almost surely, 2^{211211020111111} is an apocalyptic number.

211211020111111 is a deficient number, since it is larger than the sum of its proper divisors (1).

211211020111111 is an equidigital number, since it uses as much as digits as its factorization.

211211020111111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 211211020111111 its reverse (111111020112112), we get a palindrome (322322040223223).

The spelling of 211211020111111 in words is "two hundred eleven trillion, two hundred eleven billion, twenty million, one hundred eleven thousand, one hundred eleven".