211131992111 has 2 divisors, whose sum is σ = 211131992112. Its totient is φ = 211131992110.

The previous prime is 211131992107. The next prime is 211131992153. The reversal of 211131992111 is 111299131112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211131992111 - 2² = 211131992107 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211131992161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105565996055 + 105565996056.

It is an arithmetic number, because the mean of its divisors is an integer number (105565996056).

Almost surely, 2^211131992111 is an apocalyptic number.

211131992111 is a deficient number, since it is larger than the sum of its proper divisors (1).

211131992111 is an equidigital number, since it uses as much as digits as its factorization.

211131992111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 32.

The spelling of 211131992111 in words is "two hundred eleven billion, one hundred thirty-one million, nine hundred ninety-two thousand, one hundred eleven".