211131205123 has 2 divisors, whose sum is σ = 211131205124. Its totient is φ = 211131205122.

The previous prime is 211131205093. The next prime is 211131205163. The reversal of 211131205123 is 321502131112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211131205123 - 2⁹ = 211131204611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211131205094 and 211131205103.

It is not a weakly prime, because it can be changed into another prime (211131205163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105565602561 + 105565602562.

It is an arithmetic number, because the mean of its divisors is an integer number (105565602562).

Almost surely, 2^211131205123 is an apocalyptic number.

211131205123 is a deficient number, since it is larger than the sum of its proper divisors (1).

211131205123 is an equidigital number, since it uses as much as digits as its factorization.

211131205123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 22.

Adding to 211131205123 its reverse (321502131112), we get a palindrome (532633336235).

The spelling of 211131205123 in words is "two hundred eleven billion, one hundred thirty-one million, two hundred five thousand, one hundred twenty-three".