201211211111 has 2 divisors, whose sum is σ = 201211211112. Its totient is φ = 201211211110.

The previous prime is 201211211083. The next prime is 201211211129. The reversal of 201211211111 is 111112112102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201211211111 - 2³⁴ = 184031341927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201211216111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100605605555 + 100605605556.

It is an arithmetic number, because the mean of its divisors is an integer number (100605605556).

Almost surely, 2^201211211111 is an apocalyptic number.

201211211111 is a deficient number, since it is larger than the sum of its proper divisors (1).

201211211111 is an equidigital number, since it uses as much as digits as its factorization.

201211211111 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 14.

Adding to 201211211111 its reverse (111112112102), we get a palindrome (312323323213).

Subtracting from 201211211111 its reverse (111112112102), we obtain a palindrome (90099099009).

The spelling of 201211211111 in words is "two hundred one billion, two hundred eleven million, two hundred eleven thousand, one hundred eleven".